This simple document is adequate to register the media type as is. There are however a few small issues that could usefully be addressed. The introduction could usefully be expanded to include a couple of sentences on context and a direct reference to the protocols rather than a pointer to the IANA registry from which the reader has to get a pointer to the protocol. Bringing forward some material from the background to the introduction or merging the two sections would achieve this. The RFC 2119 language is not the latest version: The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here. I am surprised that the nits checker did not bring this up. In the text SCIP is sometimes capitalised and sometimes in lower case, they clearly mean different things but I could not see any text in the document that clarified the semantics of each variant. The references SCIP210 and SCIP214 are shown as informational. I assume that as much as anything this is because they are not widely available and strictly you could just treat them as opaque, but given they are fundamental to what you are standardising I would have expected them to be normative.