forms personalization

Is it possible to expand the description field on the "Update Standard Purchase Order" screen?

Using the Purchasing Super User responsibility, Workflow User --> Self Service Workflow --> Notifications

Click on one of the notifications(PO), then click the Edit Document link under the References section.  This takes the user to the "Update Standard Purchase Order" screen.  Click on the Lines tab and what our users see is a very small description field that they would like to be expanded.  Can this be done?