Include original INDD filename in metadata on PDF export.

I often get PDFs from clients, usually well after a job has been completed, where they want to update it, or base a new document on the PDF. Some clients, no matter how many times you tell them not to, change the name of the PDF file, making it a little more difficult to find the source file. Or a new client will send me a PDF that I did not create... then I have to ask for the source file, and of course you get "deer in the headlights eyes". If you could point them to an exact filename that might help before you tell them you have to recreate the file from scratch. If you could include the original INDD filename in the PDF metadata that would help a LOT.