diff --git a/README.md b/README.md
index 5186f5e..446ef17 100644
--- a/README.md
+++ b/README.md
@@ -4,4 +4,5 @@ An example of using [PostCSS](https://postcss.org) in [Web Origami](https://webo
 
 This repo is a 'gist'-style partial example. It only contains two files for demonstrating the use of PostCSS, not all the dependencies required for running an actual development server.
 
-`post
+* `transform-postcss.js` uses PostCSS to process a CSS file.
+* `site.ori` maps the output from `transform-postcss.js` to a CSS file and a source map file.