cmark

diff --git a/README.md b/README.md
@@ -10,9 +10,10 @@ The implementations
 The C implementation provides both a library and a standalone program
 `stmd` that converts markdown to HTML.  It is written in standard C99
 and has no library dependencies.  (However, if you check it out from the
-repository, you'll need `re2c` to generate `scanners.c` from
-`scanners.re`.  This is only a build dependency for developers, since
-`scanners.c` can be provided in a released source tarball.)
+repository, you'll need [`re2c`](http://re2c.org) to generate
+`scanners.c` from `scanners.re`.  This is only a build dependency for
+developers, since `scanners.c` can be provided in a released source
+tarball.)
 
     Usage:   stmd [FILE*]
     Options: --help, -h    Print usage information