===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/mandoc/mdoc_validate.c,v
retrieving revision 1.255
retrieving revision 1.256
diff -c -r1.255 -r1.256
*** src/usr.bin/mandoc/mdoc_validate.c	2017/06/24 14:38:27	1.255
--- src/usr.bin/mandoc/mdoc_validate.c	2017/06/24 15:59:28	1.256
***************
*** 1,4 ****
! /*	$OpenBSD: mdoc_validate.c,v 1.255 2017/06/24 14:38:27 schwarze Exp $ */
  /*
   * Copyright (c) 2008-2012 Kristaps Dzonsons <kristaps@bsd.lv>
   * Copyright (c) 2010-2017 Ingo Schwarze <schwarze@openbsd.org>
--- 1,4 ----
! /*	$OpenBSD: mdoc_validate.c,v 1.256 2017/06/24 15:59:28 schwarze Exp $ */
  /*
   * Copyright (c) 2008-2012 Kristaps Dzonsons <kristaps@bsd.lv>
   * Copyright (c) 2010-2017 Ingo Schwarze <schwarze@openbsd.org>
***************
*** 2568,2573 ****
--- 2568,2580 ----
  	 * Mdocdate conventions because we don't know
  	 * the operating system earlier.
  	 */
+ 
+ 	if (n->child != NULL)
+ 		mandoc_vmsg(MANDOCERR_OS_ARG, mdoc->parse,
+ 		    n->child->line, n->child->pos,
+ 		    "Os %s (%s)", n->child->string,
+ 		    mdoc->meta.os_e == MANDOC_OS_OPENBSD ?
+ 		    "OpenBSD" : "NetBSD");
  
  	while (n->tok != MDOC_Dd)
  		if ((n = n->prev) == NULL)