I don't know of a way to modify the Down Nodes resource to add a description, so I just created a custom property for a description and then replaced the down nodes resource with a report from report writer that shows any node with a status of warning or down and also shows the value of the description custom property. I attached screen shots of the report writer wizard for the report. Let me know if you have any questions about how it's set up.
Hope this helps!
Down Nodes report description.pdf 119.9 KB
I have covered this in numerous forum posts but it gets lost easily.
Look at http://thwack.com/members/sotherls/files/StatusUpdateResource.JPG.aspx to see how we are doing it. There is a custom resource called 'Outages.ascx' which incorporates these fields and lets you see them on your views. You can find it here: Resource to display reason for outage (9.5.x)
You need to allow some users to edit the nodes' custom properties, especially one called Status_Info'. Our Application Development staff actually put together a front end tool which allows our HelpDesk folks to post the data directly into the Status_Info field but as long as you allow thm the ability to edit the nodes that should work as well (and less complicated).
Hope this helps.