diff --git a/CHANGELOG b/CHANGELOG
index 35495d28ad..42c8b50a4a 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,9 @@
 devel
 -----
+
+* Fixed internal issue #4597: rebalanceShards API cannot work on any database
+  other than the _system database.
+
 * Fixed UPSERT matching.
 
   Empty objects in the `UPSERT { ... }` expression will not be omitted anymore: