diff --git a/setup.py b/setup.py
index dcc8eb937..b1f35be83 100644
--- a/setup.py
+++ b/setup.py
@@ -612,6 +612,8 @@ args = {
     'classifiers': [
         'License :: OSI Approved :: GNU General Public License v2 or later (GPLv2+)',
         'Development Status :: 5 - Production/Stable',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3 :: Only',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Operating System :: Microsoft :: Windows',