diff --git a/UPDATING b/UPDATING
index 3b056eec8227..b370f2f3ebb4 100644
--- a/UPDATING
+++ b/UPDATING
@@ -27,6 +27,12 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 15.x IS SLOW:
 	world, or to merely disable the most expensive debugging functionality
 	at runtime, run "ln -s 'abort:false,junk:false' /etc/malloc.conf".)
 
+20230909:
+	Enable vnet sysctl variables to be loader tunable. SYSCTLs which
+	belongs to VNETs can be initialized during early boot or module
+	loading if they are marked with CTLFLAG_TUN and there are
+	corresponding kernel environment variables.
+
 20230901:
 	The WITH_INIT_ALL_PATTERN and WITH_INIT_ALL_ZERO build options have
 	been replaced by INIT_ALL=pattern and INIT_ALL=zero respectively.