[NTG-context] Page number in the edge

Hi, moving the page number into the edge in the following way seems straightforward, but fails. “edge” is not recognised as “margin” or “header” is. I wonder why. Is this intended or am I misusing the command? \setuplayout [backspace=5cm, width=10cm, edge=1cm] \setuppagenumbering [location={header, edge}] % fails: centred in the header % [location={header, margin}] % works % also works %\setupheadertexts %[edge] [] [pagenumber] \starttext \showframe \dorecurse{10}{\null\page} \stoptext Marco