diff --git a/setup.py b/setup.py
index 9ebff734..f3b0930e 100644
--- a/setup.py
+++ b/setup.py
@@ -10,6 +10,9 @@
     author_email="info@scrapy.org",
     url="https://github.com/scrapy/w3lib",
     packages=find_packages(exclude=("tests", "tests.*")),
+    package_data={
+        "w3lib": ["py.typed"],
+    },
     include_package_data=True,
     zip_safe=False,
     platforms=["Any"],
diff --git a/w3lib/py.typed b/w3lib/py.typed
new file mode 100644
index 00000000..e69de29b