diff --git a/routing/custom_route_loader.rst b/routing/custom_route_loader.rst
index be494ca04ce..ad2191fb471 100644
--- a/routing/custom_route_loader.rst
+++ b/routing/custom_route_loader.rst
@@ -147,7 +147,8 @@ Now define a service for the ``ExtraLoader``:
         services:
             # ...
 
-            AppBundle\Routing\ExtraLoader: [routing.loader]
+            AppBundle\Routing\ExtraLoader:
+                tags: [routing.loader]
 
     .. code-block:: xml