Simply have them refer to the rules of the Series 0 award and read about the provisions for a stopover. Or have them go to their own website where it is pretty clearly noted: http://www.continental.com/web/en-US...?O=US&D=US&P=T.

It is also worth correcting my post above: the stopover costs 20K extra in F so there is an up-charge from the 10K cost in Y.