diff --git a/mitmproxy/py.typed b/mitmproxy/py.typed
new file mode 100644
index 000000000..e69de29bb
diff --git a/setup.py b/setup.py
index 543b2da33..7f5f24eb9 100644
--- a/setup.py
+++ b/setup.py
@@ -43,6 +43,7 @@ setup(
         "Topic :: Internet :: Proxy Servers",
         "Topic :: System :: Networking :: Monitoring",
         "Topic :: Software Development :: Testing",
+        "Typing :: Typed",
     ],
     packages=find_packages(include=[
         "mitmproxy", "mitmproxy.*",