subject change in reply

Steven wrote:

> > [Ralph wrote:]
> > BTW, to begin a thread, please don't reply to an existing message
> > on the list and change the subject
>
> That makes sense, but (a) I wasn't trying to start a new thread, and
> (b) I replied to an existing message without changing the subject.

I did it here:
https://lists.nongnu.org/archive/html/nmh-workers/2022-02/msg00034.html

This message doesn't have References, so it should comply.

David