diff --git a/RobThree/TwoFactorAuth/TwoFactorAuth.php b/RobThree/TwoFactorAuth/TwoFactorAuth.php
index 4273bbb..ca40c85 100644
--- a/RobThree/TwoFactorAuth/TwoFactorAuth.php
+++ b/RobThree/TwoFactorAuth/TwoFactorAuth.php
@@ -3,7 +3,7 @@
 namespace RobThree\TwoFactorAuth;
 
 // Based on / inspired by: https://github.com/PHPGangsta/GoogleAuthenticator
-// Algorithms, digits, period etc. explained: https://code.google.com/p/google-authenticator/wiki/KeyUriFormat
+// Algorithms, digits, period etc. explained: https://github.com/google/google-authenticator/wiki/Key-Uri-Format
 class TwoFactorAuth 
 {
     private $algorithm;