diff --git a/types/deepmerge/index.d.ts b/types/deepmerge/index.d.ts
index 5b5e3806bd..797e52c8a5 100644
--- a/types/deepmerge/index.d.ts
+++ b/types/deepmerge/index.d.ts
@@ -3,6 +3,7 @@
 // Definitions by: marvinscharle <https://github.com/marvinscharle>
 //                 syy1125 <https://github.com/syy1125>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.1
 
 export = deepmerge;