Document `{, }' subexpressions in eqn.7.

diff --git a/eqn.7 b/eqn.7
index 64aed29d11d30c46b8a78ffa8a8f2f46e833f3d4..a496f9f1b6519c4843aa8a460c82a8b370a79a28 100644 (file)
--- a/eqn.7
+++ b/eqn.7
@@ -1,4 +1,4 @@
-.\"    $Id: eqn.7,v 1.7 2011/07/21 11:57:56 kristaps Exp $
+.\"    $Id: eqn.7,v 1.8 2011/07/21 12:34:09 kristaps Exp $
 .\"
 .\" Copyright (c) 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 .\"
@@ -63,6 +63,7 @@ The equation grammar is as follows:
 .Bd -literal -offset indent
 eqn     : box | eqn box
 box     : text
+       | { eqn }
         | DEFINE text text
         | SET text text
         | UNDEF text