diff --git a/reference/twig_reference.rst b/reference/twig_reference.rst
index b6960b1e729..a6cbfc1d8a4 100644
--- a/reference/twig_reference.rst
+++ b/reference/twig_reference.rst
@@ -134,6 +134,9 @@ Filters
 Tags
 ----
 
+.. versionadded:: 2.3
+    The stopwatch tag was added in Symfony 2.3
+
 +---------------------------------------------------+--------------------------------------------------------------------+
 | Tag Syntax                                        | Usage                                                              |
 +===================================================+====================================================================+
@@ -150,6 +153,9 @@ Tags
 | ``{% trans_default_domain language %}``           | This will set the default domain for message catalogues in the     |
 |                                                   | current template                                                   |
 +---------------------------------------------------+--------------------------------------------------------------------+
+| ``{% stopwatch name %}...{% endstopwatch %}``     | This will time the run time of the code inside it and put that on  |
+|                                                   | the timeline of the WebDeveloperBundle.                            |
++---------------------------------------------------+--------------------------------------------------------------------+
 
 Tests
 -----