I want one output of a pyt to appear in the Table of Contents, but not the second o/p

Hi,

I have a pyt which outputs a shapefile and a csv file, I want the shapefile output to be displayed when the processing finishes, but don't want the csv file to be added to the Table of Contents in ArcGIS. Is there any way to tell arcpy to add one output to the Table of Contents but not the other ?

Chris