diff --git a/README.md b/README.md
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+[This source code](https://github.com/elliotnunn/CubeE) has been
+floating around [since
+2006](http://web.archive.org/web/20070205150052/http://crave.cnet.co.uk/digitalmusic/0,39030901,49260346-20036509o,00.htm).
+
+This repository contains everything you need to produce a System 7 disk
+image that will boot, build the source into a ROM image, and shut down.
+
+	$ cd BuildCubeE
+	$ pip3 install -r requirements.txt
+	$ ./Build --help
diff --git a/requirements.txt b/requirements.txt
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+machfs