diff --git a/routing/external_resources.rst b/routing/external_resources.rst
index b3246bb9d8a..4c070d776d4 100644
--- a/routing/external_resources.rst
+++ b/routing/external_resources.rst
@@ -92,8 +92,10 @@ in that directory are parsed and put into the routing.
 
             return $collection;
 
-Prefixing Imported Routes
-~~~~~~~~~~~~~~~~~~~~~~~~~
+.. _prefixing-imported-routes:
+
+Prefixing the URLs of Imported Routes
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 You can also choose to provide a "prefix" for the imported routes. For example,
 suppose you want to prefix all routes in the AppBundle with ``/site`` (e.g.
@@ -101,6 +103,18 @@ suppose you want to prefix all routes in the AppBundle with ``/site`` (e.g.
 
 .. configuration-block::
 
+    .. code-block:: php-annotations
+
+        use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
+
+        /**
+         * @Route("/site")
+         */
+        class DefaultController
+        {
+            // ...
+        }
+
     .. code-block:: yaml
 
         # app/config/routing.yml