diff --git a/setup.py b/setup.py
index 2531131..de91ded 100755
--- a/setup.py
+++ b/setup.py
@@ -20,6 +20,9 @@ setup(
         'License :: OSI Approved :: MIT License',
         'Operating System :: OS Independent',
         'Programming Language :: Python',
+        'Programming Language :: Python :: 2.6',
+        'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
         'Topic :: Communications :: Email',
         'Topic :: Communications :: Email :: Post-Office',
         'Topic :: Communications :: Email :: Post-Office :: IMAP',