diff --git a/doc/source/changes.rst b/doc/source/changes.rst
index d0f94623..edfd6f21 100644
--- a/doc/source/changes.rst
+++ b/doc/source/changes.rst
@@ -7,6 +7,7 @@ Bug fixes
 
 * `#502 <https://bitbucket.org/openpyxl/openpyxl/issue/502>`_ Unexpected keyword "mergeCell"
 * `#503 <https://bitbucket.org/openpyxl/openpyxl/issue/503>`_ tostring missing in dump_worksheet
+* `#506 <https://bitbucket.org/openpyxl/openpyxl/issues/506>`_ Non-ASCII formulae cannot be parsed
 
 
 2.2.5 (2015-06-29)