README.md: Document the syntax used in the README

[swc-git-example.git] / README.md

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 Show how project development generally works in [Git][].
 
+Markup
+======
+
+This file is written in [Markdown][], a popular markup language.  The
+`.md` extension is a hint so renderers like [GitHub][] can format it
+appropriately.
+
 
 [Git]: http://www.git-scm.com/
+[Markdown]: http://daringfireball.net/projects/markdown/
+[GitHub]: https://github.com/github/markup#markups