diff --git a/README.rst b/README.rst
index b607ed6ba..2395b3c73 100644
--- a/README.rst
+++ b/README.rst
@@ -8,6 +8,8 @@ Style
 
 It's using the `Sphinx Documentation Generator <http://sphinx.pocoo.org/>`_. The syntax follows the `reStructuredText <http://docutils.sourceforge.net/rst.html>`_ style, and can also be edited from GitHub.
 
+For PHP documentation you'll need to get the according language domain package. The documenation for PHP source is located at http://packages.python.org/sphinxcontrib-phpdomain/reference.html
+
 Manuals
 -------