diff --git a/setup.py b/setup.py
index 0e7ca69a..4ee1b7f0 100644
--- a/setup.py
+++ b/setup.py
@@ -190,6 +190,10 @@ def run_setup(extensions):
             'Programming Language :: Python :: 2',
             'Programming Language :: Python :: 2.6',
             'Programming Language :: Python :: 2.7',
+            'Programming Language :: Python :: 3',
+            'Programming Language :: Python :: 3.3',
+            'Programming Language :: Python :: Implementation :: CPython',
+            'Programming Language :: Python :: Implementation :: PyPy',
             'Topic :: Software Development :: Libraries :: Python Modules'
         ],
         **kw)