diff --git a/src/Symfony/Bundle/FrameworkBundle/Client.php b/src/Symfony/Bundle/FrameworkBundle/Client.php
index 4f569131ad..6de49b3104 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Client.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Client.php
@@ -41,7 +41,7 @@ class Client extends BaseClient
     /**
      * Returns the container.
      *
-     * @return ContainerInterface
+     * @return ContainerInterface|null Returns null when the Kernel has been shutdown or not started yet
      */
     public function getContainer()
     {