We have spell again, xref it. From YOMURA Masanori in private mail.

usr.bin/rs/rs.1

@@ -1,4 +1,4 @@
-.\"	$NetBSD: rs.1,v 1.7 2003/08/07 11:15:42 agc Exp $
+.\"	$NetBSD: rs.1,v 1.8 2005/09/11 23:22:03 wiz Exp $
 .\"
 .\" Copyright (c) 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -168,7 +168,7 @@ number as zero unless otherwise indicated.
 .Nm
 can be used as a filter to convert the stream output
 of certain programs (e.g.,
-.Ic spell ,
+.Xr spell 1 ,
 .Xr du 1 ,
 .Xr file 1 ,
 .Xr look 1 ,