DHCP Relay options

Dear colleagues !
Can you explain me about option:
ip dhcp-relay set relay-info-remote-id= ?

What it mean and how it works?

I have dhcp relay on the bridge wlan-ether and
I need to insert to dhcp option 82 suboption 2 (remote ID) information (for exampleMAC about remote CPE configured as bridge. Now I see MAC-address of PC’s which connected to CPE.
Maybe who knows what I can do it?