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 draft draft-ietf-core-senml-etch-05 defines new media types for the CoAP iPATCH, PATCH, and FETCH methods for resources represented with the SenML data model defined in RFC 8428. The security considerations appropriately refer to the general considerations of SenML. The document is ready.