diff --git a/UPGRADE-v2.0.md b/UPGRADE-v2.0.md
index e7f48be4..5c1584c0 100644
--- a/UPGRADE-v2.0.md
+++ b/UPGRADE-v2.0.md
@@ -145,8 +145,8 @@ Example. Before:
 class UserInput(InputObjectType):
     id = ID()
 
-def is_user_id(id):
-    return id.startswith('userid_')
+    def is_user_id(id):
+        return id.startswith('userid_')
 
 class Query(ObjectType):
     user = graphene.Field(User, input=UserInput())