diff --git a/src/Symfony/Component/HttpFoundation/Session/Storage/MockFileSessionStorage.php b/src/Symfony/Component/HttpFoundation/Session/Storage/MockFileSessionStorage.php
index 00e997b068a46..947fd865f95e9 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Storage/MockFileSessionStorage.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Storage/MockFileSessionStorage.php
@@ -13,7 +13,8 @@
 
 /**
  * MockFileSessionStorage is used to mock sessions for
- * functional testing when done in a single PHP process.
+ * functional testing where you may need to persist session data
+ * across separate PHP processes.
  *
  * No PHP session is actually started since a session can be initialized
  * and shutdown only once per PHP execution cycle and this class does