v.digit and snapping

[Markus Neteler]

Hi,

usually I am working raster-oriented, so I have questions
concerning snapping nodes in v.digit:

When digitizing a polygon (with mouse digitizer), how to
make the end nodes of a polygon to be snapped automatically?
Changing the snapping distance didn't help (and using always
the Edit menu is a ot of extra work). What did I miss? 
I need the polygons to be closed.

Markus