Parece ser o comando .chinfo
:
### chinfo [channel] [info-line/none] Sets the information line for a user. This line is shown via the /msg commands 'who' and 'whois'. If you have set greet on, it is also shown when the user joins the channel. If the info line begins with an '@', then it is "locked", and that user may no longer change it. If the channel name is omitted, the default info line is changed. If you specify 'none' as the info-line, it will be erased.