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Document: draft-nottingham-rfc5988bis-??
Reviewer: Stewart Bryant
Review Date: 2017-05-24
IETF LC End Date: 2017-05-26
IESG Telechat date: 2017-06-08

Summary:
This is a well written document, and ready for publication.

I found an IANA consideration a little confusing, but I am sure that either IANA understand it or will ask for clarification.

Major issues:

Minor issues:
I found the IANA considerations confusing. Specifically it looks like Section 4.1 refers to 
https://www.iana.org/assignments/message-headers/message-headers.xhtml
although it does not say so in so many words.

Assuming that to be the case the IANA text in section 4.1 (which copies the text from RFC5688)
does not line up column by column with the text in the registry. I assume that 
[RFC&rfc.number;] means [This RFC], but do not see where Author/Change control fits in the 
registry.

Nits/editorial comments: 

In the intro and the abstract the text "a model for indicate the relationships" is not good grammar.