diff --git a/types/smooth-scroll/index.d.ts b/types/smooth-scroll/index.d.ts
index 9a0b86696f..87f90cc298 100644
--- a/types/smooth-scroll/index.d.ts
+++ b/types/smooth-scroll/index.d.ts
@@ -2,6 +2,7 @@
 // Project: https://github.com/cferdinandi/smooth-scroll
 // Definitions by: Andrei Horodinca <https://github.com/andreiho>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.1
 
 export as namespace SmoothScroll;