diff --git a/docs/content/tutorial/step_07.ngdoc b/docs/content/tutorial/step_07.ngdoc
index 8ccc15022460..b0e92311ccb7 100644
--- a/docs/content/tutorial/step_07.ngdoc
+++ b/docs/content/tutorial/step_07.ngdoc
@@ -98,6 +98,10 @@ of configuring the injector. As opposed to AMD or require.js modules, Angular mo
 solve the problem of script load ordering or lazy script fetching. These goals are totally independent and
 both module systems can live side by side and fulfil their goals.
 
+For deepen your understanding of DI on Angular, see
+[how Angular's dependency injection system works](https://github.com/angular/angular.js/wiki/Understanding-Dependency-Injection),
+by  Brandon Tilley.
+
 ## Template
 
 The `$route` service is usually used in conjunction with the {@link ngRoute.directive:ngView
@@ -330,4 +334,4 @@ step 8} to implement the phone details view.
 <ul doc-tutorial-nav="7"></ul>
 
 
-[bower]: http://bower.io
\ No newline at end of file
+[bower]: http://bower.io