Clarify users must be joined to an allowed room.
@@ -59,7 +59,7 @@ an invite are rejected.
When an homeserver receives a `/join` request from a client or a `/make_join` /
`/send_join` request from another homeserver, the request should only be permitted
-if the user has a valid invite or is in one of the listed rooms. If the user is
+if the user is invited to this room, or is joined to one of the listed rooms. If the user is
not a member of at least one of the rooms, the homeserver should return an error
response with HTTP status code of 403 and an `errcode` of `M_FORBIDDEN`.
