diff --git a/free-programming-books.md b/free-programming-books.md
index 7b13374f..4f613db7 100644
--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -822,7 +822,8 @@
 * [Conversational Git](http://blog.anvard.org/conversational-git/)
 * [Git From The Bottom Up](http://ftp.newartisans.com/pub/git.from.bottom.up.pdf) (PDF)
 * [Git Immersion](http://gitimmersion.com)
-* [Git internals](https://github.com/pluralsight/git-internals-pdf/raw/master/drafts/peepcode-git.pdf) (PDF)
+* [Git internals](https://github.com/pluralsight/git-internals-pdf/raw/master/drafts/peepcode-git.pdf) - Scott Chacon (PDF)
+* [GitHub Cheat Sheet](https://github.com/tiimgreen/github-cheat-sheet) - Tim Green (Markdown)
 * [Git In The Trenches](http://cbx33.github.io/gitt/index.html)
 * [Git Magic](http://www-cs-students.stanford.edu/~blynn/gitmagic/)
 * [Git Pocket Guide](http://chimera.labs.oreilly.com/books/1230000000561/index.html) - Richard E. Silverman