diff --git a/docs/source/conf.py b/docs/source/conf.py
index 81910a3..c04bb3f 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -54,7 +54,7 @@
 # ones.
 extensions = [
     'sphinxcontrib.openapi',
-    'sphinx.ext.graphviz'
+    'sphinx.ext.graphviz',
 ]
 
 # Add any paths that contain templates here, relative to this directory.