docs: Add TODO to `Proposal`.
@@ -117,6 +117,7 @@ pub enum Proposal {
PreSharedKey(PreSharedKeyProposal),
ReInit(ReInitProposal),
ExternalInit(ExternalInitProposal),
+ // TODO(#916): `AppAck` is not in draft-ietf-mls-protocol-16.
AppAck(AppAckProposal),
GroupContextExtensions(GroupContextExtensionProposal),
}
