add_filter('upload_mimes', 'add_custom_upload_mimes');
  function add_custom_upload_mimes($existing_mimes) {
  	$existing_mimes['otf'] = 'application/x-font-otf';
  	$existing_mimes['woff'] = 'application/x-font-woff';
  	$existing_mimes['ttf'] = 'application/x-font-ttf';
  	$existing_mimes['svg'] = 'image/svg+xml';
  	$existing_mimes['eot'] = 'application/vnd.ms-fontobject';
  	return $existing_mimes;
  }