diff --git a/src/AuthorizationServer.php b/src/AuthorizationServer.php
index bbe9c4b8..a298944f 100644
--- a/src/AuthorizationServer.php
+++ b/src/AuthorizationServer.php
@@ -26,7 +26,7 @@ class AuthorizationServer implements EmitterAwareInterface
 {
     use EmitterAwareTrait;
 
-    const ENCRYPTION_KEY_ERROR = 'You must set the encryption key going forward to improve the security of this library - see this page for more information https://xxxx/xxxx';
+    const ENCRYPTION_KEY_ERROR = 'You must set the encryption key going forward to improve the security of this library - see this page for more information https://oauth2.thephpleague.com/v5-security-improvements/';
 
     /**
      * @var GrantTypeInterface[]