Command - /ChanServ SET DESC
Usage   - /ChanServ SET <#channel> DESC [description]
Usage   - /ChanServ SET <#channel> DESC NONE
This command changes the channel's description.
Note: You need FOUNDER access on the channel to use this command.
Example(s):
/ChanServ SET #kobi DESC kobi's channel
/ChanServ SET #kobi DESC NONE