[NTG-context] blank page in doublesided mode

In doublesided mode ConTeXt seems to insert a blank page at the end of a document when there is an odd number of printed pages. I have checked the English documentation and so far I have only found out how to force a page in order to produce an even paged document. I have yet to come across anything that seems to show how to stop ConTeXt from adding a blank page. Any pointers will be very gratefully received. Alan