diff --git a/src/parser/index.js b/src/parser/index.js
index a3492a4b54..a9882ff30a 100644
--- a/src/parser/index.js
+++ b/src/parser/index.js
@@ -1,3 +1,5 @@
+/* @noflow */
+
 import { reservedWords } from "../util/identifier";
 import { getOptions } from "../options";
 import Tokenizer from "../tokenizer";