diff --git a/README.md b/README.md
index 4854fa1..9382df2 100644
--- a/README.md
+++ b/README.md
@@ -182,7 +182,7 @@ case of an error. The callback provided should return boolean true or
 false.
 
 ```php
-Valitron\Validator::addRule('alwaysFail', function($field, $value, array $params) {
+Valitron\Validator::addRule('alwaysFail', function($field, $value, array $params, array $fields) {
     return false;
 }, 'Everything you do is wrong. You fail.');
 ```