The text proposes adding a new event called "Relay List Metadata" which will contain information about the relays used by the author to read or write messages. This event will help users find the events of the people they follow and help tagged events get to the people tagged. The content of this event is not defined, but it should be an empty string. It is suggested that people spread their kind `10002` events to many relays, but write their normal feed-related events to a much smaller number of relays (between 2 to 6 relays). Authors may post events outside of the feed that they wish their followers to follow by posting them to relays outside of those listed in their "Relay List Metadata".
Link: https://github.com/nostr-protocol/nips/blob/master/65.md