===================================================================
RCS file: /cvs/mandoc/roff.7,v
retrieving revision 1.63
retrieving revision 1.68
diff -u -p -r1.63 -r1.68
--- mandoc/roff.7	2015/01/20 21:16:51	1.63
+++ mandoc/roff.7	2015/01/23 20:18:40	1.68
@@ -1,4 +1,4 @@
-.\"	$Id: roff.7,v 1.63 2015/01/20 21:16:51 schwarze Exp $
+.\"	$Id: roff.7,v 1.68 2015/01/23 20:18:40 schwarze Exp $
 .\"
 .\" Copyright (c) 2010, 2011, 2012 Kristaps Dzonsons <kristaps@bsd.lv>
 .\" Copyright (c) 2010, 2011, 2013, 2014 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: January 20 2015 $
+.Dd $Mdocdate: January 23 2015 $
 .Dt ROFF 7
 .Os
 .Sh NAME
@@ -1003,7 +1003,7 @@ This is a groff extension and currently ignored.
 .Ss \&hypp
 Define hyphenation penalties.
 This is a Heirloom extension and currently ignored.
-.Ss \&hys
+.Ss \&hys
 Set hyphenation space.
 This is a groff extension and currently ignored.
 .Ss \&ie
@@ -1318,7 +1318,7 @@ Switch to no-fill mode.
 See
 .Xr man 7 .
 Ignored by
-.Xr mdoc 7.
+.Xr mdoc 7 .
 .Ss \&nh
 Turn off automatic hyphenation mode.
 Currently ignored.
@@ -1439,7 +1439,7 @@ Retrieve the bounding box of a PostScript file.
 Currently unsupported.
 .Ss \&pshape
 Set a special shape for the current paragraph.
-This is a Heirloom extension and currently ignored.
+This is a Heirloom extension and currently unsupported.
 .Ss \&pso
 Include output of a shell command.
 Ignored because insecure.
@@ -1552,7 +1552,7 @@ Currently ignored.
 .Ss \&ss
 Set space character size.
 Currently ignored.
-.Ss \&sty
+.Ss \&sty
 Associate style with a font position.
 This is a groff extension and currently ignored.
 .Ss \&substring
@@ -1572,7 +1572,7 @@ See
 .Ss \&ta
 Set tab stops.
 Takes an arbitrary number of arguments.
-Currently ignored.
+Currently unsupported.
 .Ss \&tc
 Change tab repetion character.
 Currently unsupported.
@@ -1582,7 +1582,7 @@ See
 .Sx \&TS .
 .Ss \&ti
 Temporary indent.
-Currently ignored.
+Currently unsupported.
 .Ss \&tkf
 Enable track kerning for a font.
 Currently ignored.
@@ -1715,6 +1715,14 @@ prefixed by an optional sign
 .Sq +
 or
 .Sq - .
+Each number may be followed by one optional scaling unit described below
+.Sx Scaling Widths .
+The following equations hold:
+.Bd -literal -offset indent
+1i = 6v = 6P = 10m = 10n = 72p = 1000M = 240u = 240
+254c = 100i = 24000u = 24000
+1f = 65536u = 65536
+.Ed
 .Pp
 The following binary operators are implemented.
 Unless otherwise stated, they behave as in the C language:
@@ -1948,10 +1956,11 @@ For short names, there are variants
 and
 .No \en( Ns Ar cc .
 .Ss \eo\(aq Ns Ar string Ns \(aq
-Overstrike
-.Ar string ;
-ignored by
-.Xr mandoc 1 .
+Overstrike, writing all the characters contained in the
+.Ar string
+to the same output position.
+In terminal and HTML output modes,
+only the last one of the characters is visible.
 .Ss \eR\(aq Ns Ar name Oo +|- Oc Ns Ar number Ns \(aq
 Set number register; ignored by
 .Xr mandoc 1 .