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The following MWE deliberately shows two ways of getting a short rule beneath a chapter number, but neither achieve what I want. \underbar is too close to the number and \crlf\blackrule too far below. So basically my question is: is there a way of adjusting the position of a brief rule beneath the number? It probably involves neither of the approaches I have used here, but I am not sure just what approach to take, other than using a background layer... and maybe that is what I need to do. Julian \define[2]\MyChapterCommand% {\framed[frame=on,bottomframe=off,leftframe=off,rightframe=off,topframe=off,align=middle] {\vbox{\headtext{chapter} \underbar{#1}\crlf\blackrule[height=.1\exheight]\crlf#2}}} \setuphead[chapter][ header=empty, alternative=middle, style={\ssb}, number=yes, command=\MyChapterCommand, after={\blank[big]}, ] \setuplabeltext[chapter= ] \starttext \chapter[title={Chapter title}] \stoptext