diff --git a/doc/conf.py b/doc/conf.py
index 628fc172..70c2cf2e 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -96,7 +96,7 @@ master_doc = 'index'
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = None
+# language = None
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.