How can I get discount to show on the quote sent to the customer?

How can I get discount to show on the quote sent to the customer?

Hi,
 
When creating a quote there is an option to add a discount. However, when the quote is sent to a customer or extracted as a PDF the discount does not show.
 
We would really like to be able to show on our quotes what discount amount the customer has recieved.
 
Any help would be appreciated.
 
Thank you