[NTG-context] Columnset and footnotes

Dear list. When i write a footnote in my document (two columns), ConTeXt do not draw the hrule above the footnote. What is the problem? \definecolumnset[n2][n=2,balance=yes] \starttext \startcolumnset[n2] Footnote \footnote[foo]{This is a footnote.} \input linden \stopcolumnset \stoptext Thanks