RFC 4707, "Netnews Administration System (NAS)", October 2006

Errata ID: 5837
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Julien Élie
Date Reported: 2019-08-18

Section 6.1.2 says:

   Answers of the type 1xx, 2xx, 4xx, and
   5xx can have a text after the numerical code.  3xx answers contain
   one or more parameters with data; the exact format is explained in
   the description of the commands.

Notes:

These sentences are not clear.
I suggest to just remove them, or reformulate them if they really have importance.
The 202 response code for VERS also has a parameter with data (the current protocol level) for instance.
And 6xx response codes are not mentioned.

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