diff --git a/setup.py b/setup.py
index 7ab0d267c934ab93c8910a28b8157a1319303d10..b874657f73f7a091538e703c9e88998db603c955 100644
--- a/setup.py
+++ b/setup.py
@@ -48,6 +48,7 @@ setup(
       'License :: OSI Approved :: GNU General Public License v3 (GPLv3)',
       'Natural Language :: English',
       'Programming Language :: Python',
+      'Programming Language :: Python :: 3',
       'Topic :: System :: Clustering',
       ]
 )