diff --git a/types/webgl-ext/index.d.ts b/types/webgl-ext/index.d.ts
index 4b9b6c579d..e8e2e94e2f 100644
--- a/types/webgl-ext/index.d.ts
+++ b/types/webgl-ext/index.d.ts
@@ -2,6 +2,7 @@
 // Project: http://webgl.org/
 // Definitions by: Arthur Langereis <https://github.com/zenmumbler>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped/webgl-ext
+// TypeScript Version: 2.7
 
 // render-gl1/declarations - WebGL 1 extension definitions (beyond TS lib)
 // Extracted from Stardazed - https://github.com/stardazed/stardazed