I am an assigned INT directorate reviewer for https://datatracker.ietf.org/doc/html/draft-ietf-6man-snac-router-ra-flag-02 
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The document defines a new IPv6 ND Router Advertisement (RA) flag, the "SNAC router" flag, which SNAC routers use to identify RAs sent by other SNAC routers. This is a rather simple (although incomplete at the moment, potentially waiting for IANA assignment) definition of a flag. 

According to reference [draft-ietf-snac-simple-05], the flag is a bit inside the RA flags field. For completeness, I think the full definition should be included in a single document (e.g., in this document draft-ietf-6man-snac-router-ra-flag), and not duplicated. 

The behaviour of the SNAC router to use this flag is defined in reference [draft-ietf-snac-simple-05]. On the other hand, some behaviour of non-SNAC routers is described in this document draft-ietf-6man-snac-router-ra-flag. I’m not sure if this behaviour modifies/updates RFC 4681 and 5175? If so, more information is needed. If not, a reference would be more appropriate.