===================================================================
RCS file: /cvs/mandoc/eqn.7,v
retrieving revision 1.22
retrieving revision 1.23
diff -u -p -r1.22 -r1.23
--- mandoc/eqn.7	2011/07/23 12:10:16	1.22
+++ mandoc/eqn.7	2011/07/23 18:41:18	1.23
@@ -1,4 +1,4 @@
-.\"	$Id: eqn.7,v 1.22 2011/07/23 12:10:16 kristaps Exp $
+.\"	$Id: eqn.7,v 1.23 2011/07/23 18:41:18 kristaps Exp $
 .\"
 .\" Copyright (c) 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 .\"
@@ -30,11 +30,13 @@ and
 .Xr man 7
 .Ux
 manual pages.
-This manual describes the subset of the
+This manual describes the
 .Nm
 language accepted by the
 .Xr mandoc 1
-utility.
+utility, which correspond to the Second Edition eqn specification (see
+.Sx SEE ALSO
+for references).
 .Pp
 Equations within
 .Xr mdoc 7
@@ -66,6 +68,8 @@ eqn     : box | eqn box
 box     : text
         | \*q{\*q eqn \*q}\*q
         | \*qdefine\*q text text
+        | \*qndefine\*q text text
+        | \*qtdefine\*q text text
         | \*qgfont\*q text
         | \*qgsize\*q text
         | \*qset\*q text text
@@ -145,6 +149,13 @@ foo bar 'baz'
 .Ed
 .Pp
 Self-referencing definitions will raise an error.
+The
+.Cm ndefine
+statement is a synonym for
+.Cm define ,
+while
+.Cm tdefine
+is discarded.
 .It Cm gfont
 Set the default font of subsequent output.
 Its syntax is as follows: