diff --git a/source/ch-git-github.ptx b/source/ch-git-github.ptx
index 0a0b53b..60c32ec 100644
--- a/source/ch-git-github.ptx
+++ b/source/ch-git-github.ptx
@@ -96,7 +96,7 @@ efficiently.
 An example of a project using Git and GitHub is the
 document you're reading right now!
 This book is open-sourced and shared at
-<url href="https://github.com/code4math/github-for-mathematicians"/>,
+<url href="https://github.com/code4mathorg/github-for-mathematicians"/>,
 and was authored completely in a web browser using only the GitHub features
 we will explore together in this handbook.
         </p>