diff --git a/graphene/relay/__init__.py b/graphene/relay/__init__.py
index 3aece07a..8934ea58 100644
--- a/graphene/relay/__init__.py
+++ b/graphene/relay/__init__.py
@@ -9,8 +9,8 @@ from .types import (
     PageInfo,
     Edge,
     Connection,
-    SimpleConnection
-    ClientIDMutation
+    SimpleConnection,
+    ClientIDMutation,
 )
 
 from .utils import is_node