Toggle the description on and off in Invoices

It would be nice to toggle the description on and off the one located at the top of the invoice page between the Invoice ID and the Issue date. If you save the invoice as a PDF the description doesn't show up. If the description applies to the whole invoice, it would be nice for it to show at the top. For example, I send bi-weekly invoices to a cabinet supplier because I'm subcontracted for work; I write the date for the two weeks the invoice applies to in the description.