===================================================================
RCS file: /cvs/mandoc/roff.7,v
retrieving revision 1.64
retrieving revision 1.67
diff -u -p -r1.64 -r1.67
--- mandoc/roff.7	2015/01/20 22:45:07	1.64
+++ mandoc/roff.7	2015/01/23 00:42:00	1.67
@@ -1,4 +1,4 @@
-.\"	$Id: roff.7,v 1.64 2015/01/20 22:45:07 schwarze Exp $
+.\"	$Id: roff.7,v 1.67 2015/01/23 00:42:00 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
@@ -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 .