Add comment about where to find ptx

share/man/man0/tocrc

@@ -1,6 +1,6 @@
 #!/bin/sh -
 #
-#	$NetBSD: tocrc,v 1.2 1998/01/09 08:04:10 perry Exp $
+#	$NetBSD: tocrc,v 1.3 2001/06/24 02:33:06 hubertf Exp $
 #
 # Copyright (c) 1993
 #	The Regents of the University of California.  All rights reserved.
@@ -59,6 +59,7 @@ fi
 
 cat tocx* cshcmd > /tmp/cattoc
 
+# If this fails, try gptx from GNU textutils (pkgsrc/text/textutils)
 ptx -r -t -b break -f -w 108 -i ignore /tmp/cattoc ptxx
 
 for x in 1 2 3 4 5 6 7 8; do