This Guaranty may not be amended except in writing signed by the Required Banks (or the Administrative Agent at the written direction of the Required Banks) (or all of the Banks if required under the terms of the Credit Agreement), each Guarantor, and, solely for purposes of its acknowledgment thereof, the Administrative Agent, subject to Section 12.02 of the Credit Agreement; provided , however, that any Subsidiary Guarantor may be released hereunder in accordance with the terms of Section 6.10 of the Credit Agreement, and any Subsidiary may become a Guarantor hereunder by executing and delivering an Accession Agreement and any other applicable documents in accordance with Section 6.10 of the Credit Agreement.