diff --git a/lib/libc/sys/bind.2 b/lib/libc/sys/bind.2
index 685e15fe2576..e4a35e196232 100644
--- a/lib/libc/sys/bind.2
+++ b/lib/libc/sys/bind.2
@@ -1,4 +1,4 @@
-.\"	$NetBSD: bind.2,v 1.24 2004/05/13 10:20:57 wiz Exp $
+.\"	$NetBSD: bind.2,v 1.25 2005/08/30 15:05:04 jmmv Exp $
 .\"
 .\" Copyright (c) 1983, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -29,7 +29,7 @@
 .\"
 .\"     @(#)bind.2	8.1 (Berkeley) 6/4/93
 .\"
-.Dd October 16, 2001
+.Dd August 30, 2005
 .Dt BIND 2
 .Os
 .Sh NAME
@@ -167,3 +167,17 @@ and
 packets destined for a server that bound to the
 same port with
 .Li INADDR_ANY .
+.Pp
+.Fn bind
+was changed in
+.Nx 4.0
+to honor the user's umask when binding sockets in the local domain.
+This was done to match the behavior of other operating systems, including
+.Fx ,
+.Ox and
+Linux, and to improve compatibility with some third-party software.
+Please note that this behavior
+.Em is not portable .
+If you must bind a local socket in a portable and secure way, you need
+to make a directory with tight permissions and then create the socket
+inside it.