diff --git a/UPDATING b/UPDATING
index f874a036959f..0a7e13e951cb 100644
--- a/UPDATING
+++ b/UPDATING
@@ -5,6 +5,11 @@ This file is maintained and copyrighted by M. Warner Losh
 of file for further details.  For commonly done items, please see the
 COMMON ITEMS: section later in the file.
 
+20010924:
+	The buildworld has been fixed.  You may need to install
+	the 4.x compatibility libraries for some old binaries
+	to work.
+
 20010919:
 	There's a bug in the world build process.  The cross-tools
 	are build with the NEW headers, but the OLD libc.a.  This