Am Do., 6. Aug. 2020 um 19:48 Uhr schrieb Arthur A. Gleckler
<xxxxxx@speechcode.com>:

> We should include some explanation since not everyone is aware of this linguistic convention.  If Amirouche agrees, I'll make the change and add a simple erratum note.  Is there a reference to which I can point?  There's RFC 2119, but is there something Scheme-specific?

It's the language used in the R7RS document if this helps.