===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/mandoc/mandoc.1,v
retrieving revision 1.155
retrieving revision 1.156
diff -c -r1.155 -r1.156
*** src/usr.bin/mandoc/mandoc.1	2018/11/22 11:30:15	1.155
--- src/usr.bin/mandoc/mandoc.1	2018/12/15 19:30:19	1.156
***************
*** 1,4 ****
! .\"	$OpenBSD: mandoc.1,v 1.155 2018/11/22 11:30:15 schwarze Exp $
  .\"
  .\" Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
  .\" Copyright (c) 2012, 2014-2018 Ingo Schwarze <schwarze@openbsd.org>
--- 1,4 ----
! .\"	$OpenBSD: mandoc.1,v 1.156 2018/12/15 19:30:19 schwarze Exp $
  .\"
  .\" Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
  .\" Copyright (c) 2012, 2014-2018 Ingo Schwarze <schwarze@openbsd.org>
***************
*** 15,21 ****
  .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  .\"
! .Dd $Mdocdate: November 22 2018 $
  .Dt MANDOC 1
  .Os
  .Sh NAME
--- 15,21 ----
  .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  .\"
! .Dd $Mdocdate: December 15 2018 $
  .Dt MANDOC 1
  .Os
  .Sh NAME
***************
*** 1676,1682 ****
  .It Sy "invalid escape sequence"
  .Pq roff
  An escape sequence has an invalid opening argument delimiter, lacks the
! closing argument delimiter, or the argument has too few characters.
  If the argument is incomplete,
  .Ic \e*
  and
--- 1676,1683 ----
  .It Sy "invalid escape sequence"
  .Pq roff
  An escape sequence has an invalid opening argument delimiter, lacks the
! closing argument delimiter, the argument is of an invalid form, or it is
! a character escape sequence with an invalid name.
  If the argument is incomplete,
  .Ic \e*
  and
***************
*** 1689,1694 ****
--- 1690,1701 ----
  .Ic \ew
  to the length of the incomplete argument.
  All other invalid escape sequences are ignored.
+ .It Sy "undefined escape, printing literally"
+ .Pq roff
+ In an escape sequence, the first character
+ right after the leading backslash is invalid.
+ That character is printed literally,
+ which is equivalent to ignoring the backslash.
  .It Sy "undefined string, using \(dq\(dq"
  .Pq roff
  If a string is used without being defined before,
***************
*** 2154,2159 ****
--- 2161,2173 ----
  .Nm
  was found in an input file.
  It is replaced by a question mark.
+ .It Sy "unsupported escape sequence"
+ .Pq roff
+ An input file contains an escape sequence supported by GNU troff
+ or Heirloom troff but not by
+ .Nm ,
+ and it is likely that this will cause information loss
+ or considerable misformatting.
  .It Sy "unsupported roff request"
  .Pq roff
  An input file contains a