Display the taxonomy term description with views contextual filters

Hi!

I have a problem with the using of views.

I have replaced my default taxonomy term page with views (and it works), but the problem is that I want to display the description of my taxonomy term at the top of the taxonomy term page, but I don't know how to proceed.

I have made a taxonomy term view block with a field "description" and with a contextual filter (the screenshoot of this filter is here: www.exploratheque.net/images/forum2.png).
But when I display my block on my taxonomy term I don't see the description of my term.

Where is my mistake?

Thanks a lot!