Add convention on relay selection

22.md

@@ -44,6 +44,12 @@ Also, there is always an `r` tag pointing to the subject being directly commente
 same structure of the `o` tag.
 This tag is useful to lazily load a thread.
 
+#### Thread Relays
+
+If the original post being commented on is a nostr event and
+the client supports the [NIP-65](65.md) relay usage spec,
+`kind:1111` events should be sent atleast to the original post author's `read` relays.
+
 ### Event Examples
 
 ```js