diff --git a/app/code/Magento/Sales/Controller/Adminhtml/Invoice/AbstractInvoice/Pdfinvoices.php b/app/code/Magento/Sales/Controller/Adminhtml/Invoice/AbstractInvoice/Pdfinvoices.php
index 5afad1030060a9dbe6c52724a1b809b59734a093..12c563f57151dd608d2233f0b3b193d0c33366bf 100644
--- a/app/code/Magento/Sales/Controller/Adminhtml/Invoice/AbstractInvoice/Pdfinvoices.php
+++ b/app/code/Magento/Sales/Controller/Adminhtml/Invoice/AbstractInvoice/Pdfinvoices.php
@@ -45,6 +45,8 @@ abstract class Pdfinvoices extends \Magento\Sales\Controller\Adminhtml\Order\Abs
     }
 
     /**
+     * Save collection items to pdf invoices
+     *
      * @param AbstractCollection $collection
      * @return ResponseInterface
      * @throws \Exception