diff --git a/src/Symfony/Component/DependencyInjection/Container.php b/src/Symfony/Component/DependencyInjection/Container.php
index e822643439..e385f06898 100644
--- a/src/Symfony/Component/DependencyInjection/Container.php
+++ b/src/Symfony/Component/DependencyInjection/Container.php
@@ -159,7 +159,7 @@ class Container implements ResettableContainerInterface
     /**
      * Sets a service.
      *
-     * Setting a service to null resets the service: has() returns false and get()
+     * Setting a synthetic service to null resets it: has() returns false and get()
      * behaves in the same way as if the service was never created.
      *
      * @param string $id      The service identifier