public function add_help_tab( $args ) {
    $defaults = array(
      'title'    => false,
      'id'       => false,
      'content'  => '',
      'callback' => false,
      'priority' => 10,
    );
    $args     = wp_parse_args( $args, $defaults );

    $args['id'] = sanitize_html_class( $args['id'] );

    // Ensure we have an ID and title.
    if ( ! $args['id'] || ! $args['title'] ) {
      return;
    }

    // Allows for overriding an existing tab with that ID.
    $this->_help_tabs[ $args['id'] ] = $args;
  }