Original text:
information about a client that any existing member can use to add this client to the group asynchronously. <del> A ClientInitKey object specifies what ciphersuites a client supports, as well as providing public keys that the client can use for key derivation and signing.  The client's identity key is intended to be stable throughout the lifetime of the group; there is no mechanism to change it.  Init keys are intended to be used a very limited number of times, potentially once. (see init-key-reuse).  ClientInitKeys also contain an identifier chosen by the client, which the client MUST assure uniquely identifies a given ClientInitKey object among the set of ClientInitKeys created by this client. The init_keys array MUST have the same length as the cipher_suites array, and each entry in the init_keys array MUST be a public key for the asymmetric encryption scheme defined in the cipher_suites array and used in the HPKE construction for TreeKEM. The whole structure is signed using the client's identity key.  A ClientInitKey object with an invalid signature field MUST be considered malformed.  The input to the signature computation comprises all of the fields except for the signature field. </del>  8.

Reviewer comments:
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Revised text:
information about a client that any existing member can use to add this client to the group asynchronously.  <ins> A ClientInitKey object specifies a ciphersuite that the client supports, as well as providing a public key that others can use for key agreement.  The client's identity key is intended to be stable throughout the lifetime of the group; there is no mechanism to change it.  Init keys are intended to be used a very limited number of times, ideally only once.  (See init-key-reuse).  Clients MAY generate and publish multiple ClientInitKey objects to support multiple ciphersuites, or to reduce the likelihood of init key reuse. ClientInitKeys contain an identifier chosen by the client, which the client MUST assure uniquely identifies a given ClientInitKey object among the set of ClientInitKeys created by this client. The value for init_key MUST be a public key for the asymmetric encryption scheme defined by cipher_suite.  The whole structure is signed using the client's identity key.  A ClientInitKey object with an invalid signature field MUST be considered malformed.  The input to the signature computation comprises all of the fields except for the signature field. </ins> 8.