Instead of modifying the README, can you make a mention of these changes in ```ChangeLog.md``` under the QIIME 1.7.0-dev heading? You'll want to put a brief summary of the changes, as well as the new QIIME dependency (PyFeast) and credits to the contributing authors.

The rest of the instructions are useful, but will likely work better in a separate tutorial. Take a look at the existing QIIME tutorials [here](http://qiime.org/tutorials/index.html). The sources for these tutorials can be found under ```Qiime/doc/tutorials/```, so feel free to use one as a starting point. The tutorials are in [RST](http://docutils.sourceforge.net/rst.html) and processed by [Sphinx](http://sphinx-doc.org/).

To build the QIIME documentation (in order to view your rendered tutorial), run the following commands (assuming you're sitting at the root level of the QIIME repo):

```
cd doc
make clean
make html
```

The resulting HTML files will be under ```_build/html/```.

You'll also need to mention the new PyFeast dependency in ```doc/install/install.rst``` (add it below the SourceTracker lines).