diff --git a/MANIFEST.in b/MANIFEST.in
index 3d26d254..e8fa093e 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -6,6 +6,7 @@ include CHANGES.md
 include Makefile
 include setup.py
 include setup.cfg
+include lib/py.typed
 
 include bin/markdown2
 include test/api.doctests
diff --git a/lib/py.typed b/lib/py.typed
new file mode 100644
index 00000000..e69de29b