diff --git a/doc/changes.qbk b/doc/changes.qbk
index 03fe1987..cd7cba86 100644
--- a/doc/changes.qbk
+++ b/doc/changes.qbk
@@ -293,5 +293,6 @@ C++11 support has resulted in some breaking changes:
   objects wouldn't match the container elements, so elements might be in the
   wrong bucket and equivalent elements would be incorrectly handled.
 * Various reference documentation improvements.
+* Better allocator support ([ticket 12459]).
 
 [endsect]