diff --git a/deprecation.py b/deprecation/__init__.py
similarity index 100%
rename from deprecation.py
rename to deprecation/__init__.py
diff --git a/deprecation/__init__.pyi b/deprecation/__init__.pyi
new file mode 100644
index 0000000..ef10b3a
--- /dev/null
+++ b/deprecation/__init__.pyi
@@ -0,0 +1,33 @@
+"""Stubs file for `deprecation.py`.
+
+Created using mypy's `stubgen`, types manually corrected.
+"""
+
+import datetime
+from packaging import version
+from typing import Callable, Optional, Union
+
+message_location: str
+
+class DeprecatedWarning(DeprecationWarning):
+    function: str
+    deprecated_in: Union[datetime.date, version.Version, None]
+    removed_in: Union[datetime.date, version.Version, None]
+    details: Union[datetime.date, version.Version, None]
+    def __init__(
+        self,
+        function: str,
+        deprecated_in: Union[datetime.date, version.Version, None],
+        removed_in: Union[datetime.date, version.Version, None],
+        details: str = ...,
+    ) -> None: ...
+
+class UnsupportedWarning(DeprecatedWarning): ...
+
+def deprecated(
+    deprecated_in: Union[str, datetime.date, version.Version, None] = ...,
+    removed_in: Union[str, datetime.date, version.Version, None] = ...,
+    current_version: Union[str, datetime.date, version.Version, None] = ...,
+    details: str = ...,
+) -> Callable: ...
+def fail_if_not_removed(method: Callable) -> Callable: ...
diff --git a/deprecation/py.typed b/deprecation/py.typed
new file mode 100644
index 0000000..b61ad4c
--- /dev/null
+++ b/deprecation/py.typed
@@ -0,0 +1,2 @@
+# Marker file for PEP 561. automeas uses inline type hints.
+# https://peps.python.org/pep-0561/
diff --git a/setup.py b/setup.py
index 3fb5feb..d001d54 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@
 
 
 def _read_file():
-    with open("deprecation.py", "r") as f:
+    with open("deprecation/__init__.py", "r") as f:
         return f.read()
 
 
@@ -34,7 +34,7 @@ def get_version():
       install_requires=["packaging"],
       keywords=["deprecation"],
       long_description=io.open("README.rst", encoding="utf-8").read(),
-      py_modules=["deprecation"],
+      packages=["deprecation"],
       classifiers=[
           "Development Status :: 5 - Production/Stable",
           "License :: OSI Approved :: Apache Software License",
@@ -55,4 +55,7 @@ def get_version():
           "Documentation": "http://deprecation.readthedocs.io/en/latest/",
           "Source": "https://github.com/briancurtin/deprecation",
           "Bug Tracker": "https://github.com/briancurtin/deprecation/issues"},
+      package_data = {
+          "deprecation": ["py.typed", "__init__.pyi"],
+      },
       )