added cache_clear function

--HG--
branch : trunk
diff --git a/docs/api.rst b/docs/api.rst
index 3ad17ac..a8a6779 100644
--- a/docs/api.rst
+++ b/docs/api.rst
@@ -211,6 +211,8 @@
     in HTML.  This function will not escaped objects that do have an HTML
     representation such as already escaped data.
 
+.. autofunction:: jinja2.utils.clear_caches
+
 .. autoclass:: jinja2.utils.Markup