I have reviewed this document as part of the security directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written primarily for the benefit of the security area directors. Document editors and WG chairs should treat these comments just like any other last call comments. The summary of the review is Ready. This document fixes a corner case where some features were not being negotiated properly. It's quite clear and concise, and fixes what seems to be a real problem.