diff --git a/azure/functions/py.typed b/azure/functions/py.typed
new file mode 100644
index 00000000..93a23fc7
--- /dev/null
+++ b/azure/functions/py.typed
@@ -0,0 +1 @@
+# Marker file for PEP 561. The azure.functions package uses inline types.
diff --git a/setup.py b/setup.py
index 58a29a67..d28a6dc2 100644
--- a/setup.py
+++ b/setup.py
@@ -19,6 +19,9 @@
     ],
     license='MIT',
     packages=['azure.functions'],
+    package_data={
+        'azure.functions': ['py.typed']
+    },
     extras_require={
         'dev': [
             'flake8~=3.7.9',