diff --git a/htdocs/compta/paiement.php b/htdocs/compta/paiement.php
index e8fceebb03c..5032c07cef4 100644
--- a/htdocs/compta/paiement.php
+++ b/htdocs/compta/paiement.php
@@ -808,9 +808,9 @@ if ($action == 'create' || $action == 'confirm_paiement' || $action == 'add_paie
         if ($action != 'add_paiement')
         {
         	$checkboxlabel=$langs->trans("ClosePaidInvoicesAutomatically");
-        	if ($facture->type == 2) $checkboxlabel=$langs->trans("ClosePaidCreditNotesAutomatically");
+        	if ($facture->type == Facture::TYPE_CREDIT_NOTE) $checkboxlabel=$langs->trans("ClosePaidCreditNotesAutomatically");
         	$buttontitle=$langs->trans('ToMakePayment');
-        	if ($facture->type == 2) $buttontitle=$langs->trans('ToMakePaymentBack');
+        	if ($facture->type == Facture::TYPE_CREDIT_NOTE) $buttontitle=$langs->trans('ToMakePaymentBack');
 
         	print '<br><div class="center">';
         	print '<input type="checkbox" checked name="closepaidinvoices"> '.$checkboxlabel;
diff --git a/htdocs/langs/en_US/bills.lang b/htdocs/langs/en_US/bills.lang
index 53535e58b46..484ad5f7867 100644
--- a/htdocs/langs/en_US/bills.lang
+++ b/htdocs/langs/en_US/bills.lang
@@ -496,9 +496,9 @@ CantRemovePaymentWithOneInvoicePaid=Can't remove payment since there is at least
 ExpectedToPay=Expected payment
 CantRemoveConciliatedPayment=Can't remove reconciled payment
 PayedByThisPayment=Paid by this payment
-ClosePaidInvoicesAutomatically=Classify "Paid" all standard, down-payment or replacement invoices paid entirely.
-ClosePaidCreditNotesAutomatically=Classify "Paid" all credit notes entirely paid back.
-ClosePaidContributionsAutomatically=Classify "Paid" all social or fiscal contributions paid entirely.
+ClosePaidInvoicesAutomatically=Classify automatically all standard, down payment or replacement invoices as "Paid" when payment is done entirely.
+ClosePaidCreditNotesAutomatically=Classify automatically all credit notes as "Paid" when refund is done entirely.
+ClosePaidContributionsAutomatically=Classify automatically all social or fiscal contributions as "Paid" when payment is done entirely.
 AllCompletelyPayedInvoiceWillBeClosed=All invoices with no remainder to pay will be automatically closed with status "Paid".
 ToMakePayment=Pay
 ToMakePaymentBack=Pay back