diff --git a/setup.py b/setup.py
index b40a27203..d75512eb2 100755
--- a/setup.py
+++ b/setup.py
@@ -102,5 +102,6 @@ setup(name="horizon",
                    'License :: OSI Approved :: Apache Software License',
                    'Operating System :: OS Independent',
                    'Programming Language :: Python',
-                   'Topic :: Internet :: WWW/HTTP']
+                   'Topic :: Internet :: WWW/HTTP',
+                   'Environment :: OpenStack']
 )