===================================================================
RCS file: /cvs/mandoc/mdoc.7,v
retrieving revision 1.104
retrieving revision 1.106
diff -u -p -r1.104 -r1.106
--- mandoc/mdoc.7	2010/05/14 15:17:23	1.104
+++ mandoc/mdoc.7	2010/05/14 17:31:25	1.106
@@ -1,4 +1,4 @@
-.\"	$Id: mdoc.7,v 1.104 2010/05/14 15:17:23 kristaps Exp $
+.\"	$Id: mdoc.7,v 1.106 2010/05/14 17:31:25 kristaps Exp $
 .\"
 .\" Copyright (c) 2009 Kristaps Dzonsons <kristaps@bsd.lv>
 .\"
@@ -1956,10 +1956,17 @@ This is not the case in mandoc.
 In groff, the
 .Sx \&Cd ,
 .Sx \&Er ,
+.Sx \&Ex ,
 and
-.Sx \&Ex
+.Sx \&Rv
 macros were stipulated only to occur in certain manual sections.
 mandoc does not have these restrictions.
+.It
+Newer groff and mandoc print
+.Qq AT&T UNIX
+prior to unknown arguments of
+.Sx \&At ;
+older groff did nothing.
 .El
 .Sh SEE ALSO
 .Xr mandoc 1 ,