diff --git a/CHANGES b/CHANGES
index be7f00f813..3165dca854 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,6 @@
+6268.	[func]		Offload the IXFR and AXFR processing to unblock
+			the networking threads. [GL #4367]
+
 6267.	[func]		Adjust UDP timeouts used in zone maintenance. [GL #4260]
 
 6266.	[func]		The zone option 'inline-signing' is ignored from now
diff --git a/doc/notes/notes-current.rst b/doc/notes/notes-current.rst
index adeaf5f183..fd41fbfb6c 100644
--- a/doc/notes/notes-current.rst
+++ b/doc/notes/notes-current.rst
@@ -28,11 +28,14 @@ New Features
   queries, so that resolution can be performed over a NAT64 connection.
   :gl:`#608`
 
+- Processing large incremental transfers (IXFR) can take a long time.
+  Offload the processing to a separate work thread that doesn't block
+  networking threads and keeps them free to process regular traffic.
+  :gl:`#4367`
+
 Removed Features
 ~~~~~~~~~~~~~~~~
 
-- None.
-
 - Configuring control channel to use Unix Domain Socket has an fatal error since
   BIND 9.18.  Completely remove the feature and make ``named-checkconf`` also
   report this as an error in the configuration. :gl:`#4311`