diff --git a/UPDATING b/UPDATING
index a4b23cb74555..c84e5cb94c98 100644
--- a/UPDATING
+++ b/UPDATING
@@ -1,4 +1,4 @@
-$NetBSD: UPDATING,v 1.203 2009/11/02 01:09:21 dyoung Exp $
+$NetBSD: UPDATING,v 1.204 2009/11/02 01:11:31 dyoung Exp $
 
 This file (UPDATING) is intended to be a brief reference to recent
 changes that might cause problems in the build process, and a guide for
@@ -19,7 +19,8 @@ Recent changes:
 20091101:
         After updating, it may be make the 'cleandir' target in
         src/tools/yacc/ and in src/usr.bin/yacc/ before a 'build.sh
-        -u tools' or 'build.sh -u distribution'.
+        -u tools' or 'build.sh -u distribution'.  Ditto src/tools/lex/
+        and src/usr.bin/lex/.
 
 20091001:
 	An error will create a ./usr/X11R7/lib/X11/xkb/compiled/xkb