diff --git a/MANIFEST.in b/MANIFEST.in
index 0cf8f3e0..d772c8da 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -3,5 +3,6 @@ include README.rst
 include setup.py
 include tox.ini
 include LICENSE
+include src/pluggy/py.typed
 graft testing
 recursive-exclude * *.pyc *.pyo
diff --git a/setup.cfg b/setup.cfg
index d39f6466..9efdd94f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -31,6 +31,7 @@ classifiers =
 [options]
 packages =
     pluggy
+include_package_data = True
 install_requires =
     importlib-metadata>=0.12;python_version<"3.8"
 python_requires = >=3.7
diff --git a/src/pluggy/py.typed b/src/pluggy/py.typed
new file mode 100644
index 00000000..e69de29b