Added some instructions on how to build

readme.md

@@ -45,3 +45,15 @@ On OS X you can use `pbpaste` and `pbcopy` to stream your clipboard in and out o
 Now when you paste your clipboard into an editor you will get nice, pretty printed HTML:
 
 ![After pretty printing](https://github.com/maxogden/commonjs-html-prettyprinter/raw/master/img/after.png)
+
+## Building
+
+To rebuild the html module to use the latest version of [js-beautifier], see the following instructions:
+
+- clone this repo: `git clone git://github.com/maxogden/commonjs-html-prettyprinter.git`
+- install dev dependencies: `npm install`
+- run the build: `npm run-script build`
+
+At this point, the `lib/html.js` file should have been updated with the latest copy of the source from [js-beautifier]
+
+[js-beautifier]: https://github.com/einars/js-beautify