diff --git a/src/Gateway.php b/src/Gateway.php
index 241eb7f..1b54a18 100644
--- a/src/Gateway.php
+++ b/src/Gateway.php
@@ -136,6 +136,8 @@ protected function process(Transaction $transaction)
     }
 
     /**
+     * Refund a transaction.
+     *
      * @param \CraigPaul\Moneris\Transaction|string $transaction
      * @param string|null $order
      *