diff --git a/security/custom_password_authenticator.rst b/security/custom_password_authenticator.rst
index b2d88b81008..c9eee1eb724 100644
--- a/security/custom_password_authenticator.rst
+++ b/security/custom_password_authenticator.rst
@@ -61,6 +61,7 @@ the user::
                     // (so don't put any un-trusted messages / error strings here)
                     throw new CustomUserMessageAuthenticationException(
                         'You can only log in between 2 and 4!',
+                        array(), // Message Data
                         412 // HTTP 412 Precondition Failed
                     );
                 }