diff --git a/src/CustomArgs.js b/src/CustomArgs.js
index bd0adea2..6996a317 100644
--- a/src/CustomArgs.js
+++ b/src/CustomArgs.js
@@ -1,4 +1,4 @@
-// flow
+// @flow
 
 import GraphiQLExplorer from "graphiql-explorer";
 import { isEnumType, isWrappingType } from "graphql";