The following people have contributed to this project:
* Herbert Wolverson, the primary author.
-* [Marius Gedminas](https://github.com/mgedmin) provided some fixes to the visibility system, and chapter 5. Corrected a typo in chapter 7.
+* [Marius Gedminas](https://github.com/mgedmin) provided some fixes to the visibility system, and chapter 5. Corrected a typo in chapter 7, and fixed a Markdown error in chapter 7.