diff --git a/book/service_container.rst b/book/service_container.rst
index 7be9d9d8d1f..3cfd209f62d 100644
--- a/book/service_container.rst
+++ b/book/service_container.rst
@@ -109,7 +109,7 @@ be specified in YAML, XML or PHP:
 
     .. code-block:: yaml
 
-        # app/config/config.yml
+        # app/config/services.yml
         services:
             my_mailer:
                 class:        Acme\HelloBundle\Mailer
@@ -117,7 +117,7 @@ be specified in YAML, XML or PHP:
 
     .. code-block:: xml
 
-        <!-- app/config/config.xml -->
+        <!-- app/config/services.xml -->
         <?xml version="1.0" encoding="UTF-8" ?>
         <container xmlns="http://symfony.com/schema/dic/services"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
@@ -133,7 +133,7 @@ be specified in YAML, XML or PHP:
 
     .. code-block:: php
 
-        // app/config/config.php
+        // app/config/services.php
         use Symfony\Component\DependencyInjection\Definition;
 
         $container->setDefinition('my_mailer', new Definition(