-qmail-config finds your fully-qualified hostname in DNS and puts it into
-control/me. It also selects good defaults for a few other controls.
+config-fast puts your.full.host.name into control/me. It also puts it
+into control/locals and control/rcpthosts, so that qmail will accept
+mail for your.full.host.name.
+
+You can instead use the config script, which looks up your host name in
+DNS:
+
+ # ./config
+
+config also looks up your local IP addresses in DNS to decide which
+hosts to accept mail for.