===================================================================
RCS file: /cvs/mandoc/mdoc.7,v
retrieving revision 1.167
retrieving revision 1.168
diff -u -p -r1.167 -r1.168
--- mandoc/mdoc.7	2010/11/30 21:44:59	1.167
+++ mandoc/mdoc.7	2010/12/05 15:37:30	1.168
@@ -1,4 +1,4 @@
-.\"	$Id: mdoc.7,v 1.167 2010/11/30 21:44:59 schwarze Exp $
+.\"	$Id: mdoc.7,v 1.168 2010/12/05 15:37:30 kristaps Exp $
 .\"
 .\" Copyright (c) 2009, 2010 Kristaps Dzonsons <kristaps@bsd.lv>
 .\" Copyright (c) 2010 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: November 30 2010 $
+.Dd $Mdocdate: December 5 2010 $
 .Dt MDOC 7
 .Os
 .Sh NAME
@@ -2738,6 +2738,11 @@ The following problematic behaviour is found in groff:
 .ds hist (Historic groff only.)
 .Pp
 .Bl -dash -compact
+.It
+Display macros
+.Pq Sx \&Bd , Sx \&Dl , and Sx \&D1
+may not be nested.
+\*[hist]
 .It
 .Sx \&At
 with unknown arguments produces no output at all.