diff --git a/CHANGES b/CHANGES
index 3af1d90076..5699f9da67 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,6 @@
+6309.	[bug]		Changing a zone's primaries while a refresh was in
+			progress could trigger an assertion. [GL #4310]
+
 6308.	[bug]		Prevent crashes caused by the zone journal getting
 			destroyed before all changes from an incoming IXFR are
 			written to it. [GL #4496]