Adding the Active Directory Description Field to the people search results

Hi,

I would like to include the Active Directory Description field to the people search results.  Under 'User Profiles' and 'User Properties' - I can't see how to add the AD Description field, it does not seem available.  Because then I would like to use this to add to the search service application and the metadata properties to be searched.

Am I missing something?

Cheers,

Dan