Custom hook_vud_votes does not appear to be working

I created a module with the following function:

function testmodule_vud_votes(&$votes) {
    watchdog('testmodule','test');
}

and then clicked the vud widget a few times. Nothing appeared in the logs. When I change "vud_votes" in the function name to "vud_access" and modify the parameters accordingly I do see entries appearing in the log.