Note that "^" needs an empty cell, while "s" does not.

diff --git a/tbl.7 b/tbl.7
index 5adc6c5ee0f6a4558a62b2bc0138ce06c1d5cf61..1bb8647e1b8702443db738c15b0ab732c5d89ab1 100644 (file)
--- a/tbl.7
+++ b/tbl.7
@@ -1,4 +1,4 @@
-.\"    $Id: tbl.7,v 1.9 2011/01/11 14:12:01 kristaps Exp $
+.\"    $Id: tbl.7,v 1.10 2011/01/11 14:15:56 kristaps Exp $
 .\"
 .\" Copyright (c) 2010 Kristaps Dzonsons <kristaps@bsd.lv>
 .\"
@@ -226,6 +226,8 @@ Vertically span rows from the last non-
 .Ns Cm ^
 data cell.
 It is an error to invoke a vertical span on the first layout row.
+Unlike a horizontal spanner, you must specify an empty cell (if it not
+empty, the data is discarded) in the corresponding data cell.
 .It Cm \-
 Replace the data cell (its contents will be lost) with a single
 horizontal line.