Updated per xabbuh's comment

Author: pbowyer

cookbook/doctrine/reverse_engineering.rst

@@ -102,9 +102,8 @@ execute the second command only.
 .. tip::
 
     If you want to use annotations, you must remove the XML (or YAML) files
-    after running these two commands. It is `not possible to mix XML/YAML metadata
-    definitions with annotated PHP entity class definitions 
-    <http://symfony.com/doc/current/book/doctrine.html#add-mapping-information>`_.
+    after running these two commands. This is necessary as
+    :ref:`it is not possible to mix mapping configuration formats <book-doctrine-adding-mapping>`
 
 For example, the newly created ``BlogComment`` entity class looks as follow::