update manual page

rssdl.1

@@ -6,15 +6,23 @@
 .Nd Simple RSS feed downloader that saves items in a Maildir
 .Sh SYNOPSIS
 .Nm
-.Op maildir
-.Sy <
-.Ar rss feed url
+.Ar maildir
 .Sh DESCRIPTION
 Simple RSS/Atom feed downloader that saves items in a Maildir that can be read
 with a MUA that supports Maildirs like (neo)mutt or aerc.
+
+This program reads a RSS/Atom feed from stdin, which can be piped via a fetcher
+like curl or wget, or read from a file containing that data.
+.Sh EXAMPLE
+.Bd -literal -offset -indent
+curl https://undeadly.org/cgi?action=rss | rssdl undeadly
+mutt -f undeadly
+.Ed
 .Sh SEE ALSO
 .Xr aerc 1
+.Xr curl 1
 .Xr mblaze 7
-.Xr neomutt 1
+.Xr mutt 1
+.Xr wget 1
 .Sh AUTHORS
 .An Shokara Kou Aq Mt kou@shokara.fr.to