diff --git a/sickdays/pyproject.toml b/sickdays/pyproject.toml
index 7499726..3047b4d 100644
--- a/sickdays/pyproject.toml
+++ b/sickdays/pyproject.toml
@@ -22,6 +22,9 @@ sickdays = "sickdays._cli:main"
 [tool.setuptools.packages.find]
 include = ["sickdays*"]
 
+[tool.setuptools.package-data]
+sickdays = ["py.typed"]
+
 [tool.ruff]
 target-version = "py314"
 include = ["*.py", "**/*.py"]
diff --git a/sickdays/sickdays/py.typed b/sickdays/sickdays/py.typed
new file mode 100644
index 0000000..e69de29