Adding rel="tag to the tagcloud"

The rel="tag" does not show up in the tag cloud.

I think the line
$output .= l($term->name, taxonomy_term_path($term), array('class'=>"tagadelic level$term->weight")) ." \n";

should be replaced by
$output .= l($term->name, taxonomy_term_path($term), array('class'=>"tagadelic level$term->weight", 'rel'=>"tag") ) ." \n";