diff --git a/doc/source/conf.py b/doc/source/conf.py
index 27730e1f0f3..f54b567e56f 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -273,7 +273,7 @@ class Mock(object):
         else:
             return Mock()
 
-# adding pbs_python, DRMAA_python. markupsafe, and drmaa here had no effect.
+# adding pbs_python, DRMAA_python, markupsafe, and drmaa here had no effect.
 MOCK_MODULES = ['tables', 'decorator']
 for mod_name in MOCK_MODULES:
     sys.modules[mod_name] = Mock()