[<name>] [<hostmask>] [<password>]
Adds the hostmask <hostmask> to the user specified by <name>. The
<password> may only be required if the user is not recognized by
hostmask. <password> is also not required if an owner user is
giving the command on behalf of some other user. If <hostmask> is
not given, it defaults to your current hostmask. If <name> is not
given, it defaults to your currently identified name. This message
must be sent to the bot privately (not on a channel) since it may
contain a password.