diff --git a/src/Symfony/Component/HttpFoundation/Session/Flash/FlashBag.php b/src/Symfony/Component/HttpFoundation/Session/Flash/FlashBag.php
index ce9308e154..f0a00d66a0 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Flash/FlashBag.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Flash/FlashBag.php
@@ -177,6 +177,11 @@ class FlashBag implements FlashBagInterface, \IteratorAggregate, \Countable
     /**
      * Returns the number of flashes.
      *
+     * This method does not work.
+     *
+     * @deprecated in 2.2, removed in 2.3
+     * @see https://github.com/symfony/symfony/issues/6408
+     *
      * @return int The number of flashes
      */
     public function count()