diff --git a/types/redux-immutable-state-invariant/index.d.ts b/types/redux-immutable-state-invariant/index.d.ts
index 64c3fa6851..502f7e65bf 100644
--- a/types/redux-immutable-state-invariant/index.d.ts
+++ b/types/redux-immutable-state-invariant/index.d.ts
@@ -2,6 +2,7 @@
 // Project: https://github.com/leoasis/redux-immutable-state-invariant
 // Definitions by: Remo H. Jansen <https://github.com/remojansen>, Ben Rogers <https://github.com/highflying>, Mihai Dinculescu <https://github.com/mihai-dinculescu>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
 
 import * as Redux from "redux";