diff --git a/alpaca_trade_api/polygon/py.typed b/alpaca_trade_api/polygon/py.typed
new file mode 100644
index 00000000..24adf8ad
--- /dev/null
+++ b/alpaca_trade_api/polygon/py.typed
@@ -0,0 +1,2 @@
+# Refer to PEP 561 for purpose of this file.
+# https://www.python.org/dev/peps/pep-0561/
\ No newline at end of file
diff --git a/alpaca_trade_api/py.typed b/alpaca_trade_api/py.typed
new file mode 100644
index 00000000..24adf8ad
--- /dev/null
+++ b/alpaca_trade_api/py.typed
@@ -0,0 +1,2 @@
+# Refer to PEP 561 for purpose of this file.
+# https://www.python.org/dev/peps/pep-0561/
\ No newline at end of file
diff --git a/setup.py b/setup.py
index b5e498d2..886ec387 100755
--- a/setup.py
+++ b/setup.py
@@ -35,6 +35,10 @@
         'alpaca_trade_api',
         'alpaca_trade_api.polygon',
     ],
+    package_data={
+        'alpaca_trade_api': ['py.typed'],
+        'alpaca_trade_api.polygon': ['py.typed'],
+    },
     install_requires=REQUIREMENTS,
     tests_require=REQUIREMENTS_TEST,
     setup_requires=['pytest-runner', 'flake8'],