Adding deprecation information for the rename of Ember.Router.router

source/deprecations/v2.x.html.md

@@ -876,6 +876,50 @@ let klass = factory.class;
 klass.hasSpeed('slow'); // true
 ```
 
+### Deprecations Added in 2.13
+
+#### Ember.Router.router renamed to Ember.Router.routerMicrolib
+
+##### until: 2.16.0
+##### id: ember-router.router
+
+The private `router` property of the `Ember.Router` instance (commonly found as this.router in Ember.Route instances or via router:main in the container) 
+has been renamed to `routerMicrolib` to disambiguate it from `router.js`, the microlib used within `Ember.Router`.
+
+Addon and application developers that are using the internal `router` property of `Ember.Router` should replace those usages with `Ember.Router.routerMicrolib`.
+
+This example demonstrates a common use case for `.router`. 
+
+Before:
+
+```javascript
+export default Ember.Service.extend({
+  getRouteNameFromUrl (url) {
+    const router = getContainer(this).lookup('router:main');
+    const routes = router.router.recognizer.recognize(url);
+
+    if (routes && routes.length) {
+      return routes[routes.length-1].handler;
+    }
+  }
+});
+``` 
+
+After:
+
+```javascript
+export default Ember.Service.extend({
+  getRouteNameFromUrl (url) {
+    const router = getContainer(this).lookup('router:main');
+    const routes = router.routerMicrolib.recognizer.recognize(url);
+
+    if (routes && routes.length) {
+      return routes[routes.length-1].handler;
+    }
+  }
+});
+``` 
+
 ### Deprecations Added in Pending Features
 
 #### Arguments in Component Lifecycle Hooks