diff --git a/crossplane/function/py.typed b/crossplane/function/py.typed
new file mode 100644
index 0000000..e69de29
diff --git a/pyproject.toml b/pyproject.toml
index f063d4d..2e15228 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,6 +14,7 @@ classifiers = [
   "Development Status :: 4 - Beta",
   "Programming Language :: Python",
   "Programming Language :: Python :: 3.11",
+  "Typing :: Typed",
 ]
 
 dependencies = [
@@ -63,7 +64,7 @@ packages = ["crossplane"]
 # This special environment is used by hatch fmt.
 [tool.hatch.envs.hatch-static-analysis]
 dependencies = ["ruff==0.11.2"]
-config-path = "none"           # Disable Hatch's default Ruff config.
+config-path = "none"            # Disable Hatch's default Ruff config.
 
 [tool.ruff]
 target-version = "py311"