src/Smalot/Magento/Order/OrderCreditMemo.php
public function addComment($creditmemoIncrementId, $comment = null, $notifyCustomer = null, $includeComment = null)
    {
        return $this->__createAction('order_creditmemo.addComment', func_get_args());
    }
public function addComment($creditmemoIncrementId, $comment = null, $notifyCustomer = null, $includeComment = null)
    {
        return $this->__createAction('order_creditmemo.addComment', func_get_args());
    }
public function addComment ( $ creditmemoIncrementId , $ comment = null , $ notifyCustomer = null , $ includeComment = null ) { return $ this -> __createAction ( 'order_creditmemo.addComment' , func_get_args ( ) ) ; }
Allows you to add a new comment to an existing credit memo.
Email notification can be sent to the user email.

@param string $creditmemoIncrementId
@param string $comment
@param string $notifyCustomer
@param string $includeComment

@return ActionInterface
Allows you to add a new comment to an existing credit memo . Email notification can be sent to the user email .