diff --git a/manage.py b/manage.py
--- a/manage.py
+++ b/manage.py
@@ -48,8 +48,8 @@ def pep257():
     checkers('pep257')
 
 
-manager.add_command("clean", Clean())
-manager.add_command("urls", ShowUrls())
+manager.add_command('clean', Clean())
+manager.add_command('urls', ShowUrls())
 
 if __name__ == "__main__":
     manager.run()