Document -M.

usr.bin/config/config.1

@@ -1,4 +1,4 @@
-.\"	$NetBSD: config.1,v 1.15 2014/05/05 20:52:45 wiz Exp $
+.\"	$NetBSD: config.1,v 1.16 2014/10/10 11:49:15 uebayasi Exp $
 .\"
 .\" Copyright (c) 1980, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -29,7 +29,7 @@
 .\"
 .\"     from: @(#)config.8	8.2 (Berkeley) 4/19/94
 .\"
-.Dd May 5, 2014
+.Dd Oct 10, 2014
 .Dt CONFIG 1
 .Os
 .Sh NAME
@@ -37,7 +37,7 @@
 .Nd build kernel compilation directories
 .Sh SYNOPSIS
 .Nm
-.Op Fl Ppv
+.Op Fl MPpv
 .Op Fl b Ar builddir
 .Op Fl D Ar var=value
 .Op Fl s Ar srcdir
@@ -121,6 +121,12 @@ Generate a lint configuration.
 See section
 .Sx LINT CONFIGURATION
 for details.
+.It Fl M
+Do modular build (experimental).
+Instead of linking all object files (*.o) at once, collect related object
+files into an intermedia relocatable object (*.ko), then link those *.ko
+files into the final kernel.
+This changes the order of objects in the kernel binary.
 .It Fl P
 Pack locators to save space in the resulting kernel binary.
 The amount of space saved that way is so small that this option should