diff --git a/README.org b/README.org
index 902492b..0cb3ffe 100644
--- a/README.org
+++ b/README.org
@@ -2,6 +2,8 @@
 This browser extension adds syntax highlighting and other goodies to
 the [[http://www.gigamonkeys.com/book/][online version]] of Practical Common Lisp by Peter Seibel.
 
+[[https://addons.mozilla.org/de/firefox/addon/beautify-practical-common-lisp/?src=search][Firefox Addon]]
+
 ** Features
  - syntax highlighting
  - table of contents