[STD29]    Internet Standard 29,
              <https://www.rfc-editor.org/info/std29>.
              At the time of writing, this STD comprises the following:

              Postel, J. and J. Reynolds, "Telnet Suppress Go Ahead
              Option", STD 29, RFC 858, DOI 10.17487/RFC0858, May 1983,
              <https://www.rfc-editor.org/info/rfc858>.