diff --git a/.hgignore b/.hgignore
index ae3dec0..c663dc7 100644
--- a/.hgignore
+++ b/.hgignore
@@ -9,4 +9,5 @@ gnu-prolog/thun
 venv
 build
 Thun.egg-info
-dist
\ No newline at end of file
+dist
+__pycache__
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 91f2116..7605472 100755
--- a/setup.py
+++ b/setup.py
@@ -41,6 +41,7 @@ setup(
 		'Development Status :: 4 - Beta',
 		'License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)',
 		'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
 		'Programming Language :: Other',
 		'Topic :: Software Development :: Interpreters',
 		],