diff --git a/UPDATING b/UPDATING
index 16837731fe8f..dd52a650dc8b 100644
--- a/UPDATING
+++ b/UPDATING
@@ -9,6 +9,11 @@ ITEMS:'
 	The SMPNG commit has happened.  It should work, but if it
 	doesn't, fallback to the PRE_SMPNG CVS tag.
 
+	Expect problems.  The Linux emulation panics the system on
+	boot, and there are other minor and not so minor irritations.
+	The thin skinned should switch to 4.x-stable for the next few
+	months.
+
 20000906:
 	nsswitch has been imported from NetBSD.  Among other things,
 	this means that /etc/host.conf is no longer used.  See