diff --git a/supertest-as-promised/index.d.ts b/supertest-as-promised/index.d.ts
index db0bf18e81..2c8f8b036a 100644
--- a/supertest-as-promised/index.d.ts
+++ b/supertest-as-promised/index.d.ts
@@ -2,6 +2,7 @@
 // Project: https://github.com/WhoopInc/supertest-as-promised
 // Definitions by: Tanguy Krotoff <https://github.com/tkrotoff>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.1
 
 import * as supertest from "supertest";
 import * as superagent from "superagent";