diff --git a/playground/ng-metadata.legacy.d.ts b/playground/ng-metadata.legacy.d.ts
index 94e907b..a71b21a 100644
--- a/playground/ng-metadata.legacy.d.ts
+++ b/playground/ng-metadata.legacy.d.ts
@@ -1,5 +1,5 @@
-// import * as angular from 'angular';
-// import Subject = require('rxjs/Subject');
+/// <reference path="../manual_typings/angular-extension.d.ts" />
+
 declare type Observable<T> = any;
 declare type Subject<T> = any;