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+All settings are changed in `minetest.conf`. If any of these settings
+is not set, the default value is used.
+
+* `irc.server` (string, default `irc.freenode.net`) -- This is the IRC
+  server the mod connects to.
+* `irc.channel` (string, default `##mt-irc-mod`) -- The IRC channel to join.
+* `irc.interval` (number, default `2.0`) -- This prevents the server from
+  flooding. It should be at least `2.0` but can be higher. After four
+  messages this much time must pass between folowing messages.
+* `irc.timeout` (number, default `60.0`) -- Underlying socket timeout in
+  seconds. This is the time before the system drops an idle connection.
+* `irc.nick` (string, default `MT-<server-id>`) -- Nickname used by the "bot"
+  for the in-game chat. "<server-id>" is a random 32 bit number.
+* `irc.password` (string, default empty) -- Password to use when connecting
+  to the server.
+* `irc.NSPass` (string, default empty) -- NickServ password. Don't use this
+  if you use SASL authentication.
+* `irc.SASLPass` (string, default empty) -- SASL password, same as nickserv
+  password. You should use this instead of NickServ authentication if the
+  server supports it.
+* `irc.SASLUser` (string, default `irc.nick`) -- The SASL username. This
+  should normaly be set to your main NickServ account name.
+* `irc.debug` (boolean, default false) -- Whether to output debug information.
+* `irc.disable_auto_connect` (boolean, default false) -- If false, the bot is
+  connected by default. If true, a player with the `irc_admin` privilege has
+  to use the `/irc_connect` command to connect to the server.
+* `irc.disable_auto_join` (boolean, default false) -- If false, players join
+  the channel automatically upon entering the game. If true, each user must
+  manually use the `/join` command to join the channel. In any case, the
+  players may use the `/part` command to opt-out of being in the channel.