diff --git a/setup.py b/setup.py
index 40edee8b..a78d2afa 100644
--- a/setup.py
+++ b/setup.py
@@ -69,6 +69,8 @@ setup(
         'Intended Audience :: Developers',
         'License :: OSI Approved :: MIT License',
         'Natural Language :: English',
+        'Operating System :: MacOS',
+        'Operating System :: POSIX',
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',