{"action":"created","comment":{"url":"https://api.github.com/repos/tlswg/draft-ietf-tls-esni/pulls/comments/228746634","pull_request_review_id":169090322,"id":228746634,"node_id":"MDI0OlB1bGxSZXF1ZXN0UmV2aWV3Q29tbWVudDIyODc0NjYzNA==","diff_hunk":"@@ -299,8 +295,42 @@ Client MAY cache the ESNIKeys for a particular domain based on the TTL of the\n Resource Record, but SHOULD NOT cache it based on the not_after value, to allow\n servers to rotate the keys often and improve forward secrecy.\n \n-Note that the length of this structure MUST NOT exceed 2^16 - 1, as the\n-RDLENGTH is only 16 bits {{RFC1035}}.\n+Note that the length of this structure MUST NOT exceed 2^16 - 10, as the\n+RDLENGTH is only 16 bits {{RFC1035}} and 9 octets are consumed by the\n+ESNIKeys= prefix.\n+\n+## ESNIInclude\n+\n+The DNS {{RFC1035}} allows most names to act as an alias via the CNAME\n+record type. However, the apex of a zone cannot be an alias. Domain\n+owners who cooperate with other organizations for server operation\n+sometimes directly publish the A or AAAA address information for the\n+servers at the apex of their zone, while relying on the more flexible\n+CNAME for other hosted names. Unfortunately, a similar approach does\n+not work well for ESNIKeys because they are expected to be rotated\n+frequently and thus become out of date if published directly in\n+another 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