diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 00dd5a0..7deff86 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -6,6 +6,13 @@
 Changelog
 =========
 
+0.5.0 (unreleased)
+------------------
+
+**Other changes**
+
+- ndonnx now exports type annotations.
+
 0.4.0 (2024-05-16)
 ------------------
 
diff --git a/ndonnx/py.typed b/ndonnx/py.typed
new file mode 100644
index 0000000..e69de29
diff --git a/pyproject.toml b/pyproject.toml
index f6fa2f1..b410a88 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -32,11 +32,13 @@ keywords = [
 [project.urls]
 repository = "https://github.com/quantco/ndonnx"
 
-
 [tool.setuptools.packages.find]
 include = ["ndonnx"]
 namespaces = false
 
+[tool.setuptools.package-data]
+"ndonnx" = ["py.typed"]
+
 [project.scripts]
 
 [tool.docformatter]