diff --git a/types/fscreen/index.d.ts b/types/fscreen/index.d.ts
index 07f76dc8d8..da7d93ef12 100644
--- a/types/fscreen/index.d.ts
+++ b/types/fscreen/index.d.ts
@@ -2,6 +2,7 @@
 // Project: https://github.com/rafrex/fscreen#readme
 // Definitions by: Joscha Feth <https://github.com/joscha>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
 
 type Handler = () => void;
 type RequestFullScreenFunction = (element: Element) => void;