diff --git a/Contributed-apps-and-website-code.md b/Contributed-apps-and-website-code.md
index 1e21a3c..ed23b7d 100644
--- a/Contributed-apps-and-website-code.md
+++ b/Contributed-apps-and-website-code.md
@@ -60,6 +60,7 @@ Also on Github:
 #### Security
 
 - https://github.com/springload/wagtailenforcer
+- https://github.com/ahopkins/wagtail-yubikey (two factor authentication)
 
 #### Misc