===================================================================
RCS file: /cvs/mandoc/roff.7,v
retrieving revision 1.44
retrieving revision 1.45
diff -u -p -r1.44 -r1.45
--- mandoc/roff.7	2013/10/22 20:38:00	1.44
+++ mandoc/roff.7	2013/12/15 21:23:52	1.45
@@ -1,4 +1,4 @@
-.\"	$Id: roff.7,v 1.44 2013/10/22 20:38:00 schwarze Exp $
+.\"	$Id: roff.7,v 1.45 2013/12/15 21:23:52 schwarze Exp $
 .\"
 .\" Copyright (c) 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 .\" Copyright (c) 2010, 2011 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: October 22 2013 $
+.Dd $Mdocdate: December 15 2013 $
 .Dt ROFF 7
 .Os
 .Sh NAME
@@ -814,19 +814,22 @@ the name of the request, macro or string to be undefin
 Currently, it is ignored including its arguments,
 and the number of arguments is not checked.
 .Ss \&nr
-Define a register.
+Define or change a register.
 A register is an arbitrary string value that defines some sort of state,
 which influences parsing and/or formatting.
 Its syntax is as follows:
 .Pp
-.D1 Pf \. Cm \&nr Ar name Ar value
+.D1 Pf \. Cm \&nr Ar name Oo +|- Oc Ns Ar value
 .Pp
 The
 .Ar value
 may, at the moment, only be an integer.
-So far, only the following register
+If it is prefixed by a sign, the register will be 
+incremented or decremented instead of assigned to.
+.Pp
+The following register
 .Ar name
-is recognised:
+is handled specially:
 .Bl -tag -width Ds
 .It Cm nS
 If set to a positive integer value, certain