diff --git a/setup.py b/setup.py
index 4bcd5339..daa40928 100644
--- a/setup.py
+++ b/setup.py
@@ -278,4 +278,5 @@ setuptools.setup(
     install_requires=get_requirements(),
     ext_modules=ext_modules,
     cmdclass={"build_ext": BuildExtension},
+    package_data={"vllm": ["py.typed"]},
 )
diff --git a/vllm/py.typed b/vllm/py.typed
new file mode 100644
index 00000000..33b3ad73
--- /dev/null
+++ b/vllm/py.typed
@@ -0,0 +1,2 @@
+# Marker file for PEP 561.
+# The vllm package uses inline types.