(21)Regulation (EU) 2017/1129 allows issuers to extend the maximum length of the prospectus summary by one page when there is a guarantee attached to the securities, since information on both the guarantee and the guarantor needs to be provided. However, where there is more than one guarantor, an additional page might not be sufficient. It is therefore necessary to allow for the length of the prospectus summary to be further extended in the event of guarantees that are provided by more than one guarantor.