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 review comments. This document describes new DNS SRV service types for the CalDAV protocol, and a bootstrapping method by which clients can find CalDAV servers. There's not much that is security critical in the document. The security considerations section seems sufficient. I do not see the need for any changes. Brian