diff --git a/src/Symfony/Component/HttpKernel/HttpCache/Esi.php b/src/Symfony/Component/HttpKernel/HttpCache/Esi.php
index e1a0e6a271..0ab9ea0a25 100644
--- a/src/Symfony/Component/HttpKernel/HttpCache/Esi.php
+++ b/src/Symfony/Component/HttpKernel/HttpCache/Esi.php
@@ -34,9 +34,9 @@ class Esi
      * Constructor.
      *
      * @param array $contentTypes An array of content-type that should be parsed for ESI information.
-     *                           (default: text/html, text/xml, and application/xml)
+     *                           (default: text/html, text/xml, application/xhtml+xml, and application/xml)
      */
-    public function __construct(array $contentTypes = array('text/html', 'text/xml', 'application/xml'))
+    public function __construct(array $contentTypes = array('text/html', 'text/xml', 'application/xhtml+xml', 'application/xml'))
     {
         $this->contentTypes = $contentTypes;
     }