1 files changed, 2 insertions, 1 deletions
diff --git a/mandoc.h b/mandoc.h
index aea9bcf4..db14dbf6 100644
--- a/mandoc.h
+++ b/mandoc.h
@@ -1,4 +1,4 @@
-/*	$Id: mandoc.h,v 1.233 2017/06/24 14:38:32 schwarze Exp $ */
+/*	$Id: mandoc.h,v 1.234 2017/06/24 15:59:50 schwarze Exp $ */
 /*
  * Copyright (c) 2010, 2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2010-2017 Ingo Schwarze <schwarze@openbsd.org>
@@ -48,6 +48,7 @@ enum	mandocerr {
 
 	MANDOCERR_MDOCDATE, /* Mdocdate found: Dd ... */
 	MANDOCERR_MDOCDATE_MISSING, /* Mdocdate missing: Dd ... */
+	MANDOCERR_OS_ARG,  /* operating system explicitly specified: Os ... */
 	MANDOCERR_RCS_MISSING, /* RCS id missing */
 
 	MANDOCERR_STYLE, /* ===== start of style suggestions ===== */