diff --git a/setup.py b/setup.py
index 9fd5b7cf162d26c1206c3c34c64e05822508822e..5f08126e69c4f60da479ccea89df03530461f93d 100644
--- a/setup.py
+++ b/setup.py
@@ -57,6 +57,7 @@ setup(
       'License :: OSI Approved :: GNU General Public License v3 (GPLv3)',
       'Natural Language :: English',
       'Programming Language :: Python',
+      'Programming Language :: Python :: 3',
       'Topic :: Scientific/Engineering :: Artificial Intelligence',
       'Topic :: Database :: Front-Ends',
       ],