Hi, I have reviewed this document as part of the Operational directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written with the intent of improving the operational aspects of the IETF drafts. Comments that are not addressed in last call may be included in AD reviews during the IESG review. Document editors and WG chairs should treat these comments just like any other last call comments. The document defines a YANG data model for the configuration and management of RIFT (routing in fat trees) protocol. I am not a YANG expert, but the document appears to follow a similar style and layout to other YANG data model documents I have read. The associated security text seems appropriate. The nits are simply down to the large number of typos and mainly grammatical errors in the text, many around use or non-use of plurals. There is no semantic ambiguity in any that I saw, but it would be good to correct these rather than put that load on the RFC Editor. Tim