public function registerTaxonomy() {
        $namePlural = __('Topics', 'customer-feedback');
        $nameSingular = __('Topic', 'customer-feedback');

        $labels = array(
            'name'              => $namePlural,
            'singular_name'     => $nameSingular,
            'search_items'      => sprintf(__('Search %s', 'customer-feedback'), $namePlural),
            'all_items'         => sprintf(__('All %s', 'customer-feedback'), $namePlural),
            'parent_item'       => sprintf(__('Parent %s:', 'customer-feedback'), $nameSingular),
            'parent_item_colon' => sprintf(__('Parent %s:', 'customer-feedback'), $nameSingular) . ':',
            'edit_item'         => sprintf(__('Edit %s', 'customer-feedback'), $nameSingular),
            'update_item'       => sprintf(__('Update %s', 'customer-feedback'), $nameSingular),
            'add_new_item'      => sprintf(__('Add New %s', 'customer-feedback'), $nameSingular),
            'new_item_name'     => sprintf(__('New %s Name', 'customer-feedback'), $nameSingular),
            'menu_name'         => $nameSingular,
        );

        $args = array(
            'hierarchical'      => false,
            'labels'            => $labels,
            'show_ui'           => true,
            'show_admin_column' => true,
            'query_var'         => true,
            'meta_box_cb'       => false,
            'rewrite'           => array('slug' => 'topic'),
        );

        register_taxonomy('feedback_topic', array($this->postTypeSlug), $args);
    }