diff --git a/Additional-Learning-Resources.md b/Additional-Learning-Resources.md
index c0b7342..e0c7f22 100644
--- a/Additional-Learning-Resources.md
+++ b/Additional-Learning-Resources.md
@@ -7,6 +7,7 @@ You can find documentation about the core of PDF.js [here](https://github.com/Me
 You can read more about PDF.js here:
 + https://andreasgal.com/2011/06/15/pdf-js/
 + https://web.archive.org/web/20160408133647/https://blog.mozilla.org/cjones/2011/06/15/overview-of-pdf-js-guts/
++ https://blog.mozilla.org/attack-and-defense/2021/10/14/implementing-form-filling-and-accessibility-in-the-firefox-pdf-viewer/
 
 ## Presentations