https://www.gnu.org/software/m4/m4.html under Mailing Lists says, "see the details of each list for a link to the archives", but nowhere does the page explicitly state where to find the details of m4-discuss.
One can guess the appropriate URL by analogy with other mailing lists. It can also be found buried under the very specialized heading, Request and Enhancement. Nevertheless, it deserves a direct descriptive sentence. Doug McIlroy
