diff --git a/CHANGES b/CHANGES
index 98d1e3d11f..04e5aad1ff 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,9 @@
+6193.	[bug]		Fix a catz db update notification callback registration
+			logic error, which could crash named when receiving an
+			AXFR update for a catalog zone while the previous update
+			process of the catalog zone was already running.
+			[GL #4136]
+
 6192.	[placeholder]
 
 6191.	[placeholder]