===================================================================
RCS file: /cvs/mandoc/mandoc.1,v
retrieving revision 1.217
retrieving revision 1.218
diff -u -p -r1.217 -r1.218
--- mandoc/mandoc.1	2017/07/20 15:26:41	1.217
+++ mandoc/mandoc.1	2017/08/19 22:00:05	1.218
@@ -1,4 +1,4 @@
-.\"	$Id: mandoc.1,v 1.217 2017/07/20 15:26:41 schwarze Exp $
+.\"	$Id: mandoc.1,v 1.218 2017/08/19 22:00:05 schwarze Exp $
 .\"
 .\" Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 .\" Copyright (c) 2012, 2014-2017 Ingo Schwarze <schwarze@openbsd.org>
@@ -15,7 +15,7 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: July 20 2017 $
+.Dd $Mdocdate: August 19 2017 $
 .Dt MANDOC 1
 .Os
 .Sh NAME
@@ -315,6 +315,20 @@ and seven for
 .Xr man 7 .
 Increasing this is not recommended; it may result in degraded formatting,
 for example overfull lines or ugly line breaks.
+.It Cm mdoc
+Format
+.Xr man 7
+input files in
+.Xr mdoc 7
+output style.
+Specifically, this suppresses the two additional blank lines near the
+top and the bottom of each page, and it implies
+.Fl O Cm indent Ns =5 .
+One useful application is for checking that
+.Fl T Cm man
+output formats in the same way as the
+.Xr mdoc 7
+source it was generated from.
 .It Cm width Ns = Ns Ar width
 The output width is set to
 .Ar width .