--- a/src/computer_literacy/computer_literacy.html	Tue Mar 24 18:50:08 2026 -0600
+++ b/src/computer_literacy/computer_literacy.html	Wed May 27 18:46:08 2026 +0900
@@ -59,7 +59,7 @@
 
 <p>The most popular source control software is <a href="https://git-scm.com/">Git</a>.  Of course it is horrible since modern programmers only like horrible things.  We use the less popular software <a href="https://www.mercurial-scm.org/">Mercurial</a>.</p>
 
-<p>Thankfully Mercurial is well documented.  Read <a href="https://hgbook.red-bean.com/">Mercurial: The Definitive Guide</a> up to (and including) chapter 9.</p>
+<p>Thankfully Mercurial is well documented.  Read <a href="https://book.mercurial-scm.org/read/">Mercurial: The Definitive Guide</a> up to (and including) "Working together".</p>
 
 <p>To get started with Mercurial, download Mercurial from <a href="https://www.mercurial-scm.org/">their website</a> and install it.  Then do:</p>