diff --git a/gapi.analytics/gapi.analytics.d.ts b/gapi.analytics/gapi.analytics.d.ts
index da9b81cb68..dc49ffd617 100644
--- a/gapi.analytics/gapi.analytics.d.ts
+++ b/gapi.analytics/gapi.analytics.d.ts
@@ -1,4 +1,7 @@
 // Type definitions for Google Analytics API
+// Project: https://developers.google.com/analytics/devguides/reporting/core/v4/
+// Definitions by: César Costas <https://github.com/gatsbimantico>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 /// <reference path="../gapi/gapi.d.ts" />