+[Markdown: syntax](http://daringfireball.net/projects/markdown/syntax). A
+[markdown mode](http://jrblevin.freeshell.org/software/markdown-mode/) for
+emacs can help in editing.
+
+Note that [[WikiLink]]s and [[PreProcessorDirective]]s are not part of the
+markdown syntax, and are the only bit of markup that this wiki handles
+internally.