How to echo tag description on loop-page.php using WPeC 3.8

get the term by its slug and echo out the descriptions

elseif {is_tax ( 'product_tag' ) ){ 
  $term_slug = get_query_var( 'term' );
  $taxonomyName = get_query_var( 'taxonomy' );
  $current_term = get_term_by( 'slug', $term_slug, $taxonomyName );
  ?><h1 class="entry-title"><?php echo $current_term->description; ?></h1> <?php
}