diff --git a/UPDATING b/UPDATING
index ed23e930cb04..e49fe07f6e70 100644
--- a/UPDATING
+++ b/UPDATING
@@ -1,4 +1,4 @@
-$NetBSD: UPDATING,v 1.261 2015/04/04 12:15:38 martin Exp $
+$NetBSD: UPDATING,v 1.262 2015/04/14 14:18:59 christos 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
@@ -19,6 +19,11 @@ See also: BUILDING, build.sh, Makefile.
 Recent changes:
 ^^^^^^^^^^^^^^^
 
+20150413:
+	New acpica requires "make cleandir" and reinstalling yacc
+	in /usr/src/external/bsd/byacc and /usr/src/tools/yacc and
+	also "make cleandir" in /usr/src/external/bsd/acpica.
+
 20150404:
 	Lint changes require a full rebuild of the tool, so make
 	sure to build without -u option to build.sh, or manually