diff --git a/setup.py b/setup.py
index 94ab7c0..38096b3 100644
--- a/setup.py
+++ b/setup.py
@@ -18,6 +18,7 @@ setup(name="magic-wormhole",
       version=versioneer.get_version(),
       description="Securely transfer data between computers",
       long_description=open('README.md', 'rU').read(),
+      long_description_content_type='text/markdown',
       author="Brian Warner",
       author_email="warner-magic-wormhole@lothar.com",
       license="MIT",