diff --git a/openlp/core/lib/imagemanager.py b/openlp/core/lib/imagemanager.py
index 0028cc50b..8ad388674 100644
--- a/openlp/core/lib/imagemanager.py
+++ b/openlp/core/lib/imagemanager.py
@@ -113,7 +113,7 @@ class Image(object):
 
         ``source``
             The source describes the image's origin. Possible values are
-            ``image`` and ``theme``.
+            described in the :class:`~openlp.core.lib.ImageSource` class.
 
         ``background``
             A ``QtGui.QColor`` object specifying the colour to be used to fill