Drupal 7 add fields to show in RSS feed for taxonomy

iam having troubles with RSS feed. I have found that I can get feed for specific taxonomy just adding /feed after that taxonomy, but how is possible to add/remove fields from that, where can I found this "view" for this feed? Thank you

The callback is defined into hook_menu from taxonomy.module :

$items['taxonomy/term/%taxonomy_term/feed'] = array(
    'title' => 'Taxonomy term',
    'title callback' => 'taxonomy_term_title',
    'title arguments' => array(2),
    'page callback' => 'taxonomy_term_feed',
    'page arguments' => array(2),
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
    'file' => 'taxonomy.pages.inc',
  );

it call function taxonomy_term_feed

function taxonomy_term_feed($term) {
  $channel['link'] = url('taxonomy/term/' . $term->tid, array('absolute' => TRUE));
  $channel['title'] = variable_get('site_name', 'Drupal') . ' - ' . $term->name;
  // Only display the description if we have a single term, to avoid clutter and confusion.
  // HTML will be removed from feed description.
  $channel['description'] = check_markup($term->description, $term->format, '', TRUE);
  $nids = taxonomy_select_nodes($term->tid, FALSE, variable_get('feed_default_items', 10));

  node_feed($nids, $channel);
}

it call function node_feed into node.module line 2575

So you can analyse those function to understand how it works and find solution