diff --git a/lib/PayPal/Api/TransactionBase.php b/lib/PayPal/Api/TransactionBase.php
index bf92833..0fcbc70 100644
--- a/lib/PayPal/Api/TransactionBase.php
+++ b/lib/PayPal/Api/TransactionBase.php
@@ -17,7 +17,7 @@ class TransactionBase extends CartBase
      * List of financial transactions (Sale, Authorization, Capture, Refund) related to the payment.
      * 
      *
-     * @param \PayPal\Api\RelatedResources $related_resources
+     * @param \PayPal\Api\RelatedResources[] $related_resources
      * 
      * @return $this
      */