===================================================================
RCS file: /cvs/mandoc/roff.7,v
retrieving revision 1.110
retrieving revision 1.115
diff -u -p -r1.110 -r1.115
--- mandoc/roff.7	2018/12/16 01:34:56	1.110
+++ mandoc/roff.7	2020/10/28 21:07:47	1.115
@@ -1,7 +1,7 @@
-.\"	$Id: roff.7,v 1.110 2018/12/16 01:34:56 schwarze Exp $
+.\"	$Id: roff.7,v 1.115 2020/10/28 21:07:47 schwarze Exp $
 .\"
 .\" Copyright (c) 2010, 2011, 2012 Kristaps Dzonsons <kristaps@bsd.lv>
-.\" Copyright (c) 2010-2018 Ingo Schwarze <schwarze@openbsd.org>
+.\" Copyright (c) 2010-2019 Ingo Schwarze <schwarze@openbsd.org>
 .\"
 .\" Permission to use, copy, modify, and distribute this software for any
 .\" purpose with or without fee is hereby granted, provided that the above
@@ -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: December 16 2018 $
+.Dd $Mdocdate: October 28 2020 $
 .Dt ROFF 7
 .Os
 .Sh NAME
@@ -315,12 +315,18 @@ delimiters
 The proper spacing is also intelligently preserved if a sentence ends at
 the boundary of a macro line.
 .Pp
+If an input line happens to end with a period, exclamation or question
+mark that isn't the end of a sentence, append a zero-width space
+.Pq Sq \e& .
+.Pp
 Examples:
 .Bd -literal -offset indent -compact
 Do not end sentences mid-line like this.  Instead,
 end a sentence like this.
 A macro would end like this:
 \&.Xr mandoc 1 \&.
+An abbreviation at the end of an input line needs escaping, e.g.\e&
+like this.
 .Ed
 .Sh REQUEST SYNTAX
 A request or macro line consists of:
@@ -503,10 +509,9 @@ This is a Heirloom extension and currently unsupported
 .It Ic \&br
 Break the output line.
 .It Ic \&break
-Break out of a
+Break out of the innermost
 .Ic \&while
 loop.
-Currently unsupported.
 .It Ic \&breakchar Ar char ...
 Optional line break characters.
 This is a Heirloom extension and currently ignored.
@@ -908,11 +913,23 @@ This is a Heirloom extension and currently ignored.
 Enable or disable an OpenType feature.
 This is a Heirloom extension and currently ignored.
 .It Ic \&fi
-Switch to fill mode.
-See
-.Xr man 7 .
-Ignored in
-.Xr mdoc 7 .
+Break the output line and switch to fill mode,
+which is active by default but can be ended with the
+.Ic \&nf
+request.
+In fill mode, input from subsequent input lines is added to
+the same output line until the next word no longer fits,
+at which point the output line is broken.
+This request is implied by the
+.Xr mdoc 7
+.Ic \&Sh
+macro and by the
+.Xr man 7
+.Ic \&SH ,
+.Ic \&SS ,
+and
+.Ic \&EE
+macros.
 .It Ic \&fkern Ar font minkern
 Control the use of kerning tables for a font.
 This is a Heirloom extension and currently ignored.
@@ -1347,11 +1364,22 @@ Declare the need for the specified minimum vertical sp
 before the next trap or the bottom of the page.
 Currently ignored.
 .It Ic \&nf
-Switch to no-fill mode.
-See
-.Xr man 7 .
-Ignored by
-.Xr mdoc 7 .
+Break the output line and switch to no-fill mode.
+Subsequent input lines are kept together on the same output line
+even when exceeding the right margin,
+and line breaks in subsequent input cause output line breaks.
+This request is implied by the
+.Xr mdoc 7
+.Ic \&Bd Fl unfilled
+and
+.Ic \&Bd Fl literal
+macros and by the
+.Xr man 7
+.Ic \&EX
+macro.
+The
+.Ic \&fi
+request switches back to the default fill mode.
 .It Ic \&nh
 Turn off automatic hyphenation mode.
 Currently ignored.
@@ -2256,7 +2284,7 @@ code.
 .Pp
 The special semantics of the
 .Cm nS
-number register is an idiosyncracy of
+number register is an idiosyncrasy of
 .Ox
 manuals and not supported by other
 .Xr mdoc 7
@@ -2303,7 +2331,7 @@ for
 .At v2 ,
 then ported nroff to C as troff, which Brian W. Kernighan released with
 .At v7 .
-In 1989, James Clarke re-implemented troff in C++, naming it groff.
+In 1989, James Clark re-implemented troff in C++, naming it groff.
 .Sh AUTHORS
 .An -nosplit
 This