diff --git a/doc/require.rst b/doc/require.rst
index db5730f12a..61ab4bc179 100644
--- a/doc/require.rst
+++ b/doc/require.rst
@@ -20,8 +20,8 @@ PHP
 * You need GD2 support in PHP to display inline thumbnails of JPEGs
   ("image/jpeg: inline") with their original aspect ratio.
 
-* When using the cookie authentication (the default), the `mcrypt
-  <http://www.php.net/mcrypt>`_ extension is strongly suggested.
+* When using the cookie authentication (the default), the `openssl
+  <http://www.php.net/openssl>`_ extension is strongly suggested.
 
 * To support upload progress bars, see :ref:`faq2_9`.