diff --git a/docs/changelog.rst b/docs/changelog.rst
index 5be1fd9d..c543c4d8 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -46,6 +46,7 @@ Changes in 0.9.X - DEV
 - Workaround a dateutil bug #608
 - Conditional save for atomic-style operations #511
 - Allow dynamic dictionary-style field access #559
+- index_cls is ignored when deciding to set _cls as index prefix #733
 
 Changes in 0.8.7
 ================