diff --git a/setup.py b/setup.py
index <HASH>..<HASH> 100644
--- a/setup.py
+++ b/setup.py
@@ -12,7 +12,8 @@ setup(
         'Environment :: Web Environment',
         'License :: OSI Approved :: Apache Software License',
         'Operating System :: OS Independent',
-        'Programming Language :: Python :: 2'
+        'Programming Language :: Python :: 2',
+        'Programming Language :: Python :: 3',
     ],
     author='Hans Meine',
     author_email='hans_meine@gmx.net',
PY3: add trove classifier

at least, ctk-cli is passing superficial tests (e.g. with pyflakes-<I>)
and ctk-cli-indexer produced the same output with Python <I> and <I>.