Last Call Review of draft-ietf-ntp-chronos-16
review-ietf-ntp-chronos-16-opsdir-lc-zhou-2023-06-25-00

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.

This document is well written, and is ready for publication.
Only a couple of nits, for the authors consideration:
1. In the abstraction and introduction, you state "Since it does not affect the
wire protocol, the Khronos mechanism is applicable to any current or future
time protocol." I do not think "any" make sense here. This document only
applies Khronos to NTPv4. You may say, it "could be applied to other time
protocol". 2. Khronos is a technique firstly described in one paper. I would
like to see the reference at the first place, e.g., in the introduction.

Best,
Tianran