diff --git a/doc/source/conf.py b/doc/source/conf.py
index 069382be..ff4b24cc 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -113,7 +113,7 @@ add_module_names = True
 pygments_style = 'sphinx'
 
 # A list of ignored prefixes for module index sorting.
-#modindex_common_prefix = []
+modindex_common_prefix = ['keystonemiddleware.']
 
 # Grouping the document tree for man pages.
 # List of tuples 'sourcefile', 'target', 'title', 'Authors name', 'manual'