From a87269d22406c9b56df2bea3f35fbe1c4c65b853 Mon Sep 17 00:00:00 2001
From: Akira Komamura <akira.komamura@gmail.com>
Date: Sun, 19 Jan 2025 10:49:47 +0900
Subject: [PATCH 1/6] docs: Collect license files into the licenses directory

---
 doc/LICENSE.txt => LICENSES/CC-BY-SA-4.0.txt |  0
 LICENSES/MIT.txt                             | 21 ++++++++++++++++++++
 LICENSE => LICENSES/Unlicense.txt            |  0
 3 files changed, 21 insertions(+)
 rename doc/LICENSE.txt => LICENSES/CC-BY-SA-4.0.txt (100%)
 create mode 100644 LICENSES/MIT.txt
 rename LICENSE => LICENSES/Unlicense.txt (100%)

diff --git a/doc/LICENSE.txt b/LICENSES/CC-BY-SA-4.0.txt
similarity index 100%
rename from doc/LICENSE.txt
rename to LICENSES/CC-BY-SA-4.0.txt
diff --git a/LICENSES/MIT.txt b/LICENSES/MIT.txt
new file mode 100644
index 0000000..96cd942
--- /dev/null
+++ b/LICENSES/MIT.txt
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021-2024 Akira Komamura
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/LICENSE b/LICENSES/Unlicense.txt
similarity index 100%
rename from LICENSE
rename to LICENSES/Unlicense.txt

From 1c1271d73cc4fd0d02e2ab21ca63243a28ced67c Mon Sep 17 00:00:00 2001
From: Akira Komamura <akira.komamura@gmail.com>
Date: Sun, 19 Jan 2025 10:51:14 +0900
Subject: [PATCH 2/6] docs: Add the SPDX license identifier for the doc

---
 doc/src/content/docs/configuration/editor/emacs.md         | 2 ++
 doc/src/content/docs/configuration/nix-direnv.md           | 2 ++
 doc/src/content/docs/getting-started.mdoc                  | 2 ++
 doc/src/content/docs/index.mdx                             | 2 ++
 doc/src/content/docs/introduction.md                       | 2 ++
 doc/src/content/docs/patterns/ci/github-actions.mdoc       | 2 ++
 doc/src/content/docs/patterns/formatting/treefmt-nix.mdoc  | 2 ++
 doc/src/content/docs/patterns/updating/renovate.mdoc       | 2 ++
 doc/src/content/docs/recipes/elixir/phoenix.mdoc           | 2 ++
 doc/src/content/docs/recipes/gleam/app.mdoc                | 2 ++
 doc/src/content/docs/recipes/go/executable.mdoc            | 2 ++
 doc/src/content/docs/recipes/ocaml/generic.mdoc            | 2 ++
 doc/src/content/docs/recipes/rust/executable.mdoc          | 2 ++
 doc/src/content/docs/recipes/typescript/web-framework.mdoc | 2 ++
 doc/src/content/docs/recipes/zig/cli.mdoc                  | 2 ++
 doc/src/content/docs/resources.md                          | 2 ++
 16 files changed, 32 insertions(+)

diff --git a/doc/src/content/docs/configuration/editor/emacs.md b/doc/src/content/docs/configuration/editor/emacs.md
index b3094d0..7e4abfb 100644
--- a/doc/src/content/docs/configuration/editor/emacs.md
+++ b/doc/src/content/docs/configuration/editor/emacs.md
@@ -1,4 +1,6 @@
 ---
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: CC-BY-SA-4.0
 title: Emacs
 description: How to set up Emacs for using Nix flakes.
 ---
diff --git a/doc/src/content/docs/configuration/nix-direnv.md b/doc/src/content/docs/configuration/nix-direnv.md
index 3952fe4..326a2bf 100644
--- a/doc/src/content/docs/configuration/nix-direnv.md
+++ b/doc/src/content/docs/configuration/nix-direnv.md
@@ -1,4 +1,6 @@
 ---
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: CC-BY-SA-4.0
 title: Enable nix-direnv
 description: How to set up nix-direnv
 ---
diff --git a/doc/src/content/docs/getting-started.mdoc b/doc/src/content/docs/getting-started.mdoc
index a996c38..78a4220 100644
--- a/doc/src/content/docs/getting-started.mdoc
+++ b/doc/src/content/docs/getting-started.mdoc
@@ -1,4 +1,6 @@
 ---
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: CC-BY-SA-4.0
 title: Getting started with a flake template
 ---
 ## Configuration
diff --git a/doc/src/content/docs/index.mdx b/doc/src/content/docs/index.mdx
index 4a65b53..8bb799e 100644
--- a/doc/src/content/docs/index.mdx
+++ b/doc/src/content/docs/index.mdx
@@ -1,4 +1,6 @@
 ---
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: CC-BY-SA-4.0
 title: Nix Flake Templates
 description: A documentation site for Nix flake templates.
 tableOfContents: false
diff --git a/doc/src/content/docs/introduction.md b/doc/src/content/docs/introduction.md
index cf4bb8e..0118225 100644
--- a/doc/src/content/docs/introduction.md
+++ b/doc/src/content/docs/introduction.md
@@ -1,4 +1,6 @@
 ---
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: CC-BY-SA-4.0
 title: Introduction to Flake Templates
 ---
 Hello, this site provides instructions for setting up a development environment
diff --git a/doc/src/content/docs/patterns/ci/github-actions.mdoc b/doc/src/content/docs/patterns/ci/github-actions.mdoc
index 34db89e..555fd25 100644
--- a/doc/src/content/docs/patterns/ci/github-actions.mdoc
+++ b/doc/src/content/docs/patterns/ci/github-actions.mdoc
@@ -1,4 +1,6 @@
 ---
+# SPDX-FileCopyrightText: 2025 Akira Komamura
+# SPDX-License-Identifier: CC-BY-SA-4.0
 title: Continuous Integration on GitHub Actions
 ---
 
diff --git a/doc/src/content/docs/patterns/formatting/treefmt-nix.mdoc b/doc/src/content/docs/patterns/formatting/treefmt-nix.mdoc
index 92b2ff9..fc554cd 100644
--- a/doc/src/content/docs/patterns/formatting/treefmt-nix.mdoc
+++ b/doc/src/content/docs/patterns/formatting/treefmt-nix.mdoc
@@ -1,4 +1,6 @@
 ---
+# SPDX-FileCopyrightText: 2025 Akira Komamura
+# SPDX-License-Identifier: CC-BY-SA-4.0
 title: Checking formatting using treefmt-nix on GitHub Actions
 ---
 
diff --git a/doc/src/content/docs/patterns/updating/renovate.mdoc b/doc/src/content/docs/patterns/updating/renovate.mdoc
index 435c9ab..c220579 100644
--- a/doc/src/content/docs/patterns/updating/renovate.mdoc
+++ b/doc/src/content/docs/patterns/updating/renovate.mdoc
@@ -1,4 +1,6 @@
 ---
+# SPDX-FileCopyrightText: 2025 Akira Komamura
+# SPDX-License-Identifier: CC-BY-SA-4.0
 title: Updating Packages with Mend Renovate
 ---
 This tutorial explains how to automatically updates packages using Renovate Bot.
diff --git a/doc/src/content/docs/recipes/elixir/phoenix.mdoc b/doc/src/content/docs/recipes/elixir/phoenix.mdoc
index 4934f79..7659871 100644
--- a/doc/src/content/docs/recipes/elixir/phoenix.mdoc
+++ b/doc/src/content/docs/recipes/elixir/phoenix.mdoc
@@ -1,4 +1,6 @@
 ---
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: CC-BY-SA-4.0
 title: Developing an Elixir Phoenix application
 description: How to develop an Elixir Phoenix with a Nix flake template
 ---
diff --git a/doc/src/content/docs/recipes/gleam/app.mdoc b/doc/src/content/docs/recipes/gleam/app.mdoc
index 732c42b..21df700 100644
--- a/doc/src/content/docs/recipes/gleam/app.mdoc
+++ b/doc/src/content/docs/recipes/gleam/app.mdoc
@@ -1,4 +1,6 @@
 ---
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: CC-BY-SA-4.0
 title: Developing a Gleam application
 description: How to develop a server-side web application in Gleam with a Nix flake template
 ---
diff --git a/doc/src/content/docs/recipes/go/executable.mdoc b/doc/src/content/docs/recipes/go/executable.mdoc
index d9e7481..0ba3d4f 100644
--- a/doc/src/content/docs/recipes/go/executable.mdoc
+++ b/doc/src/content/docs/recipes/go/executable.mdoc
@@ -1,4 +1,6 @@
 ---
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: CC-BY-SA-4.0
 title: Developing a Go executable application
 ---
 
diff --git a/doc/src/content/docs/recipes/ocaml/generic.mdoc b/doc/src/content/docs/recipes/ocaml/generic.mdoc
index 8ff47ce..96d7762 100644
--- a/doc/src/content/docs/recipes/ocaml/generic.mdoc
+++ b/doc/src/content/docs/recipes/ocaml/generic.mdoc
@@ -1,4 +1,6 @@
 ---
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: CC-BY-SA-4.0
 title: Developing an OCaml project with Dune and Nix
 ---
 
diff --git a/doc/src/content/docs/recipes/rust/executable.mdoc b/doc/src/content/docs/recipes/rust/executable.mdoc
index e8ec5eb..ff774e6 100644
--- a/doc/src/content/docs/recipes/rust/executable.mdoc
+++ b/doc/src/content/docs/recipes/rust/executable.mdoc
@@ -1,4 +1,6 @@
 ---
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: CC-BY-SA-4.0
 title: Developing a Rust program
 description: How to develop a Rust program with a Nix flake template
 ---
diff --git a/doc/src/content/docs/recipes/typescript/web-framework.mdoc b/doc/src/content/docs/recipes/typescript/web-framework.mdoc
index ec6b82c..14fe9df 100644
--- a/doc/src/content/docs/recipes/typescript/web-framework.mdoc
+++ b/doc/src/content/docs/recipes/typescript/web-framework.mdoc
@@ -1,4 +1,6 @@
 ---
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: CC-BY-SA-4.0
 title: Developing a web application in TypeScript
 description: How to develop a web application in TypeScript with a Nix flake template
 ---
diff --git a/doc/src/content/docs/recipes/zig/cli.mdoc b/doc/src/content/docs/recipes/zig/cli.mdoc
index 014b4fd..82901ae 100644
--- a/doc/src/content/docs/recipes/zig/cli.mdoc
+++ b/doc/src/content/docs/recipes/zig/cli.mdoc
@@ -1,4 +1,6 @@
 ---
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: CC-BY-SA-4.0
 title: Developing a Zig CLI application
 ---
 
diff --git a/doc/src/content/docs/resources.md b/doc/src/content/docs/resources.md
index 20314e2..4f51c4f 100644
--- a/doc/src/content/docs/resources.md
+++ b/doc/src/content/docs/resources.md
@@ -1,4 +1,6 @@
 ---
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: CC-BY-SA-4.0
 title: Resources
 description: A collection of resources related to developing a project with Nix flakes.
 ---

From 2484aadbf4b7dc7a36e44294654ebab5ab88ce0a Mon Sep 17 00:00:00 2001
From: Akira Komamura <akira.komamura@gmail.com>
Date: Sun, 19 Jan 2025 11:03:17 +0900
Subject: [PATCH 3/6] docs: Add Unlicense SPDX license identifiers to the
 templates

---
 elixir-app/flake.nix                  | 2 ++
 elixir/flake.nix                      | 2 ++
 flake-parts/flake.nix                 | 2 ++
 flake-utils/flake.nix                 | 2 ++
 gleam/flake.nix                       | 2 ++
 go/flake.nix                          | 2 ++
 go/treefmt.nix                        | 2 ++
 meta/.github/workflows/nix-build.yml  | 2 ++
 meta/.github/workflows/nix-format.yml | 2 ++
 meta/.gitignore                       | 2 ++
 minimal/flake.nix                     | 2 ++
 node-typescript/flake.nix             | 2 ++
 ocaml/.env                            | 3 +++
 ocaml/.envrc                          | 3 +++
 ocaml/.gitignore                      | 2 ++
 ocaml/.ocamlformat                    | 4 ++++
 ocaml/flake.nix                       | 2 ++
 ocaml/justfile                        | 2 ++
 pre-commit/flake.nix                  | 2 ++
 rust/flake.nix                        | 2 ++
 treefmt/flake.nix                     | 2 ++
 treefmt/treefmt.nix                   | 2 ++
 zig/.gitignore                        | 3 +++
 zig/flake.nix                         | 2 ++
 zig/treefmt.nix                       | 2 ++
 25 files changed, 55 insertions(+)

diff --git a/elixir-app/flake.nix b/elixir-app/flake.nix
index 1c360c1..8b329e9 100644
--- a/elixir-app/flake.nix
+++ b/elixir-app/flake.nix
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2021-2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
 {
   inputs = {
     # nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
diff --git a/elixir/flake.nix b/elixir/flake.nix
index f6bebf4..c3f4c47 100644
--- a/elixir/flake.nix
+++ b/elixir/flake.nix
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2021-2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
 {
   inputs = {
     # nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
diff --git a/flake-parts/flake.nix b/flake-parts/flake.nix
index d47defb..1061b6a 100644
--- a/flake-parts/flake.nix
+++ b/flake-parts/flake.nix
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
 {
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
diff --git a/flake-utils/flake.nix b/flake-utils/flake.nix
index 5281e21..e1e094d 100644
--- a/flake-utils/flake.nix
+++ b/flake-utils/flake.nix
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2021-2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
 {
   inputs = {
     # nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
diff --git a/gleam/flake.nix b/gleam/flake.nix
index 819dcfe..b2738c4 100644
--- a/gleam/flake.nix
+++ b/gleam/flake.nix
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
 {
   inputs = {
     # nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
diff --git a/go/flake.nix b/go/flake.nix
index 47bd0af..8b93057 100644
--- a/go/flake.nix
+++ b/go/flake.nix
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2024 Akira Komamura
+# SPDX-License-Identifier: Unlicense
 {
   inputs = {
     # nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
diff --git a/go/treefmt.nix b/go/treefmt.nix
index 2fafa9f..0ef595d 100644
--- a/go/treefmt.nix
+++ b/go/treefmt.nix
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2024 Akira Komamura
+# SPDX-License-Identifier: Unlicense
 {
   projectRootFile = "treefmt.nix";
 
diff --git a/meta/.github/workflows/nix-build.yml b/meta/.github/workflows/nix-build.yml
index 8b050b3..bc7b06d 100644
--- a/meta/.github/workflows/nix-build.yml
+++ b/meta/.github/workflows/nix-build.yml
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
 name: Build the Nix package
 
 on:
diff --git a/meta/.github/workflows/nix-format.yml b/meta/.github/workflows/nix-format.yml
index e1352dd..5a51e53 100644
--- a/meta/.github/workflows/nix-format.yml
+++ b/meta/.github/workflows/nix-format.yml
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
 name: Check format
 
 on:
diff --git a/meta/.gitignore b/meta/.gitignore
index 8a75cf9..516f1ee 100644
--- a/meta/.gitignore
+++ b/meta/.gitignore
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
 result
 result-*
 .pre-commit-hooks.yaml
diff --git a/minimal/flake.nix b/minimal/flake.nix
index 789605f..2314d4f 100644
--- a/minimal/flake.nix
+++ b/minimal/flake.nix
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2021-2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
 {
   inputs = {
     # nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
diff --git a/node-typescript/flake.nix b/node-typescript/flake.nix
index ec68fe9..b9fd3e6 100644
--- a/node-typescript/flake.nix
+++ b/node-typescript/flake.nix
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2021-2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
 {
   inputs = {
     # nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
diff --git a/ocaml/.env b/ocaml/.env
index 51602f0..5f1373a 100644
--- a/ocaml/.env
+++ b/ocaml/.env
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
+
 # The default cache path is immutable when odig is installed using Nix
 ODIG_CACHE_DIR="$PWD/_build/default/.odig"
 # Using _build directory may not be properly allowed for storing user contents
diff --git a/ocaml/.envrc b/ocaml/.envrc
index 0b1a02d..5a7ff4f 100644
--- a/ocaml/.envrc
+++ b/ocaml/.envrc
@@ -1,2 +1,5 @@
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
+
 dotenv
 use flake
diff --git a/ocaml/.gitignore b/ocaml/.gitignore
index e35d885..0c37cf1 100644
--- a/ocaml/.gitignore
+++ b/ocaml/.gitignore
@@ -1 +1,3 @@
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
 _build
diff --git a/ocaml/.ocamlformat b/ocaml/.ocamlformat
index 270d50c..1cba25d 100644
--- a/ocaml/.ocamlformat
+++ b/ocaml/.ocamlformat
@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2017-2023, Facebook, Inc.
+# SPDX-FileCopyrightText: 2023-present, Tarides.
+# SPDX-License-Identifier: MIT
+
 # Latest version is available from
 # https://github.com/ocaml-ppx/ocamlformat/blob/main/.ocamlformat
 
diff --git a/ocaml/flake.nix b/ocaml/flake.nix
index 1e42610..3f9f974 100644
--- a/ocaml/flake.nix
+++ b/ocaml/flake.nix
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
 {
   inputs = {
     nixpkgs.url = "github:nix-ocaml/nix-overlays";
diff --git a/ocaml/justfile b/ocaml/justfile
index 02aea0a..75c0a01 100644
--- a/ocaml/justfile
+++ b/ocaml/justfile
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
 odig-odoc:
     odig odoc
 
diff --git a/pre-commit/flake.nix b/pre-commit/flake.nix
index 937f99e..baf9cb8 100644
--- a/pre-commit/flake.nix
+++ b/pre-commit/flake.nix
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2021-2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
 {
   inputs = {
     # nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
diff --git a/rust/flake.nix b/rust/flake.nix
index 64cb129..df75094 100644
--- a/rust/flake.nix
+++ b/rust/flake.nix
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
 {
   inputs = {
     flake-parts.url = "github:hercules-ci/flake-parts";
diff --git a/treefmt/flake.nix b/treefmt/flake.nix
index 0cea4fc..c5cc5c2 100644
--- a/treefmt/flake.nix
+++ b/treefmt/flake.nix
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2023-2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
 {
   inputs = {
     # nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
diff --git a/treefmt/treefmt.nix b/treefmt/treefmt.nix
index a6d0b15..887c81c 100644
--- a/treefmt/treefmt.nix
+++ b/treefmt/treefmt.nix
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2023-2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
 {
   projectRootFile = "treefmt.nix";
 
diff --git a/zig/.gitignore b/zig/.gitignore
index 629bfa1..da0e547 100644
--- a/zig/.gitignore
+++ b/zig/.gitignore
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
+
 # Zig
 zig-out/
 .zig-cache/
diff --git a/zig/flake.nix b/zig/flake.nix
index f5b83f6..868065f 100644
--- a/zig/flake.nix
+++ b/zig/flake.nix
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
 {
   inputs = {
     # nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
diff --git a/zig/treefmt.nix b/zig/treefmt.nix
index efcea21..df9f1f2 100644
--- a/zig/treefmt.nix
+++ b/zig/treefmt.nix
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: Unlicense
 {
   projectRootFile = "treefmt.nix";
 

From 5a59ba0c78fb29fa6fa45648faa346b62cc5f09b Mon Sep 17 00:00:00 2001
From: Akira Komamura <akira.komamura@gmail.com>
Date: Sun, 19 Jan 2025 11:04:40 +0900
Subject: [PATCH 4/6] docs: Add MIT license identifiers

---
 .gitattributes            | 2 ++
 .gitignore                | 2 ++
 dev/flake.nix             | 2 ++
 dev/update-beam.nix       | 3 +++
 doc/flake.nix             | 2 ++
 doc/src/content/config.ts | 5 +++++
 doc/treefmt.nix           | 2 ++
 flake.nix                 | 2 ++
 8 files changed, 20 insertions(+)

diff --git a/.gitattributes b/.gitattributes
index b047d93..735f129 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1 +1,3 @@
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: MIT
 *.mdoc linguist-language=Markdown
diff --git a/.gitignore b/.gitignore
index 2375406..64e3dad 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2021-2025 Akira Komamura
+# SPDX-License-Identifier: MIT
 .pre-commit-config.yaml
 result
 flake.lock
diff --git a/dev/flake.nix b/dev/flake.nix
index 33c55ae..a395764 100644
--- a/dev/flake.nix
+++ b/dev/flake.nix
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2023-2025 Akira Komamura
+# SPDX-License-Identifier: MIT
 {
   inputs = {
     # nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
diff --git a/dev/update-beam.nix b/dev/update-beam.nix
index 61ad72b..bc4d0a0 100644
--- a/dev/update-beam.nix
+++ b/dev/update-beam.nix
@@ -1,6 +1,9 @@
 /*
   This script helps the user keep Erlang (erlangRxx) and Elixir (elixir_x_xx)
   to their latest versions. It performs simple regexp substitutions in flake.nix.
+
+  SPDX-FileCopyrightText: 2022-2025 Akira Komamura
+  SPDX-License-Identifier: MIT
 */
 {
   lib,
diff --git a/doc/flake.nix b/doc/flake.nix
index c59d861..073c153 100644
--- a/doc/flake.nix
+++ b/doc/flake.nix
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: MIT
 {
   inputs = {
     systems.url = "github:nix-systems/default";
diff --git a/doc/src/content/config.ts b/doc/src/content/config.ts
index a4eec59..f0be6ea 100644
--- a/doc/src/content/config.ts
+++ b/doc/src/content/config.ts
@@ -1,3 +1,8 @@
+/*
+  SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+
+  SPDX-License-Identifier: MIT
+*/
 import { defineCollection } from "astro:content";
 import { docsSchema } from "@astrojs/starlight/schema";
 
diff --git a/doc/treefmt.nix b/doc/treefmt.nix
index fff32f8..69ea584 100644
--- a/doc/treefmt.nix
+++ b/doc/treefmt.nix
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2024-2025 Akira Komamura
+# SPDX-License-Identifier: MIT
 {
   projectRootFile = "treefmt.nix";
 
diff --git a/flake.nix b/flake.nix
index 3d8f090..7b25c55 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2021-2025 Akira Komamura
+# SPDX-License-Identifier: MIT
 {
   description = "A collection of project templates";
 

From 9245f21f04c8a05eac6bc9a09f8eabf1c481e09f Mon Sep 17 00:00:00 2001
From: Akira Komamura <akira.komamura@gmail.com>
Date: Sun, 19 Jan 2025 11:17:32 +0900
Subject: [PATCH 5/6] docs: Add a general note on licensing

---
 README.md | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/README.md b/README.md
index 3ddc27e..ec529c9 100644
--- a/README.md
+++ b/README.md
@@ -282,6 +282,18 @@ Also see [nix3.el](https://github.com/emacs-twist/nix3.el), which
 provides `nix3-flake-new` and `nix3-flake-init` commands for running a
 flake template quickly from inside Emacs.
 
+## License
+This repository uses different licenses depending on the files. The specific
+license applicable to a file or group of files is indicated in the file headers
+or in the [LICENSES](LICENSES/) directory.
+
+- The templates are released under the UNLICENSE.
+  See [LICENSES/UNLICENSE](LICENSES/Unlicense.txt) for more details.
+- The documentation is licensed under Attribution-ShareAlike 4.0 International
+(CC-BY-SA-4.0).
+- Some files are released under the MIT License.
+## Contributing
+See [CONTRIBUTING.md](./CONTRIBUTING.md).
 ## Other template repositories and alternatives
 
 The following is a list of template repositories I found on GitHub:

From 758905d8ad4ae0443c20a48dc8c0bdc94dc14a01 Mon Sep 17 00:00:00 2001
From: Akira Komamura <akira.komamura@gmail.com>
Date: Sun, 19 Jan 2025 11:22:44 +0900
Subject: [PATCH 6/6] docs: Add contributing

---
 CONTRIBUTING.md | 14 ++++++++++++++
 doc/README.md   | 13 -------------
 2 files changed, 14 insertions(+), 13 deletions(-)
 create mode 100644 CONTRIBUTING.md
 delete mode 100644 doc/README.md

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..d364be9
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,14 @@
+# Contributing
+Thank you for considering contributing to this project. Contributions help make
+this template repository more helpful. This guide outlines how to get involved,
+report issues, and submit changes.
+## Contributing the documentation
+If you have identified any errors in the instructions, please feel free to
+submit a pull request with your proposed changes.
+
+I would also appreciate any suggestions for enhancing the content. If you are
+aware of a better alternative to the described option, please feel free to open
+an issue or submit a PR.
+## Contributing to templates
+If you have noticed any error with one of the templates, please feel free to
+report an issue.
diff --git a/doc/README.md b/doc/README.md
deleted file mode 100644
index 65c3de1..0000000
--- a/doc/README.md
+++ /dev/null
@@ -1,13 +0,0 @@
-# Documentation for Flake Templates
-
-This is a companion web site for
-[flake-templates](https://github.com/akirak/flake-templates).
-
-## Contributing
-
-If you have identified any errors in the instructions, please feel free to
-submit a pull request with your proposed changes.
-
-I would also appreciate any suggestions for enhancing the content. If you are
-aware of a better alternative to the described option, please feel free to open
-an issue or submit a PR.