-Converting them to other formats requires that cmark, which is the
-reference implementation of Commonmark in C from
-<https://github.com/jgm/cmark> or Pandoc from <http://pandoc.org/> or
-some other program that can understand CommonMark be installed on your
-system.
+Converting them to other formats requires that Pandoc or some other
+program that can understand this version of Markdown be installed on
+your system.