diff --git a/api-ref/source/conf.py b/api-ref/source/conf.py
index c86fa49..be574f4 100644
--- a/api-ref/source/conf.py
+++ b/api-ref/source/conf.py
@@ -18,7 +18,7 @@ import os
 import sys
 
 extensions = [
-    'otcdocstheme'
+    'otcdocstheme',
 ]
 
 otcdocs_auto_name = False