One off Notes can be added to your Customers Invoice using the Notes section above the Payment Details, these notes will appear on the Invoice PDF.
In the Web Portal, go to CRM > Invoices > select the Edit pen for the intended invoice > scroll to Notes section > enter details > Save at the bottom of the invoice.
In the App, go to Accounts > Invoices > select the intended invoice > scroll down to Add Note (just below history) > enter details > tap on Add Note to save it to the invoice.
