Mention requirement of GitHub account

index.md

@@ -177,7 +177,7 @@ Modify the block below if there are any special requirements.
     Participants must have access to a computer with a
     Mac, Linux, or Windows operating system (not a tablet, Chromebook, etc.) that they have administrative privileges on.
   {% endif %}
-  They should have a few specific software packages installed (listed <a href="#setup">below</a>).
+  They should have a few specific software packages installed (listed <a href="#setup">below</a>) and a GitHub account ready with two-factor authentication enabled (see the guide on <a href="https://swcarpentry.github.io/git-novice/#creating-a-github-account">Creating a GitHub Account</a>).
 </p>
 
 {% comment %}