drupal_set_message on redirect to node page

It can be confusing for first time users when they are redirected to the ad's page on clicking an ad. I propose to add a drupal_set_message on page redirect to the tune of:

'You have been redirected here because you are an ad administrator. Please log out if you wish to test that the ad url is correct'

I can roll the patch if you want to add the feature.

Cheers,
Sam.