Invoice status on write-off is "Paid" - how do I change this to "Written off"

Invoice status on write-off is "Paid" - how do I change this to "Written off"

HI guys,

I want to write off a couple of outstanding invoices, but when I do this, the status of the invoices shows as "Paid". Clearly this is not the case and I need to be able to see that they are written off in the customer's history. Is there a way to show the status of written off invoices as "Written Off" rather than "Paid"?