Is there an approach to have feh --thumbnails do not display filename?

I have many pictures which are screen shots created from shutter and downloaded from web. These pictures have long file names. When I create thumbnails on these pictures via feh -t, these long file name will prevent feh to display many pictures in one row. And I did not find a solution for this on the feh man page. What can I do to display many pictures in a row?