diff --git a/.dockerignore b/.dockerignore
index 0734790..f5ebf63 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,2 +1,4 @@
-artifacts/
-target/
+# Keep this file in sync with `.gitignore` and `.ignore`, but don't ignore
+# `/release/`.
+/artifacts/
+/target/
diff --git a/.gitignore b/.gitignore
index 1883712..c6297da 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
-# Keep this file in sync with `.ignore`.
-artifacts/
-release/
-target/
+# Keep this file in sync with `.dockerignore` and `.ignore`.
+/artifacts/
+/release/
+/target/
diff --git a/.ignore b/.ignore
index d426e82..169b865 100644
--- a/.ignore
+++ b/.ignore
@@ -1,4 +1,4 @@
-# Keep this file in sync with `.gitignore`.
-artifacts/
-release/
-target/
+# Keep this file in sync with `.dockerignore` and `.gitignore`.
+/artifacts/
+/release/
+/target/