diff --git a/gnu/usr.bin/groff/tmac/mdoc.local b/gnu/usr.bin/groff/tmac/mdoc.local
index 65301d0ba599..b0754d065faa 100644
--- a/gnu/usr.bin/groff/tmac/mdoc.local
+++ b/gnu/usr.bin/groff/tmac/mdoc.local
@@ -1,4 +1,4 @@
-.\" $NetBSD: mdoc.local,v 1.31 2006/07/08 04:44:09 wiz Exp $
+.\" $NetBSD: mdoc.local,v 1.32 2006/08/08 05:42:24 riz Exp $
 .\"
 .\" Copyright (c) 2003, 2004 The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -54,9 +54,9 @@
 .as doc-str-St--p1003.1-2004    " (\*[Lq]\)\*[Px]\*[doc-str-St].1\*[Rq])
 .
 .\" Default .Os value
-.ds doc-operating-system NetBSD\~3.0
+.ds doc-operating-system NetBSD\~4.0
 .\" Default footer operating system value
-.ds doc-default-operating-system NetBSD\~3.0
+.ds doc-default-operating-system NetBSD\~4.0
 .\" Other known versions, not yet in groff distribution
 .ds doc-operating-system-NetBSD-1.6.3  1.6.3
 .ds doc-operating-system-NetBSD-2.0.1  2.0.1