diff --git a/docs/patterns.rst b/docs/patterns.rst
index a064fde..2580b84 100644
--- a/docs/patterns.rst
+++ b/docs/patterns.rst
@@ -54,7 +54,7 @@ setting other values, e.g.::
 
         @property
         def LANGUAGES(self):
-            return Configuration.LANGUAGES + (('tlh', 'Klingon'),)
+            return list(Configuration.LANGUAGES) + [('tlh', 'Klingon')]
 
 Configuration mixins
 --------------------