Dear List, After a few changes i have here an example: It works, but what I wanted to know is why are there round brackets after writing \starttheroem if i compile it. Should be without round brackets. I have the following example, the text was in a PDF from 2008, called: Theorems in ConTeXt, and also my text with the margin: \definemargindata [MyInMargin][inright] \definemarginframed[MyInMargin][topframe=on,bottomframe=on,rulethickness=1pt,width=1cm] \margintext{\blackrule[color=black, height=0.25ex, width=1cm]\\}\blackrule[color=black, height=0.25ex, width=7cm] \setupenumerations [ before={\blank[big]}, after={\blank[big]}, location=serried, width=broad, distance=0.5em, headstyle=bold, titlestyle=normal, way=bytext, conversion=numbers] \defineenumeration [theorem] [ text=Theorem, title=yes, style=italic, list=all, listtext={Theorem }] \starttext \margintext{2.1.1}{\starttheorem {The square on the hypotenuse is equal to the sum of the squares on the other two sides. Ach is das schön, dass du da bist} \stoptheorem \stoptext Maybe someone can help me.