public function directory_template_hierarchy( $templates ) {

		/**
		 * Filters the template hierarchy for the activity directory page.
		 *
		 * @since 1.8.0
		 *
		 * @param array $index-directory Array holding template names to be merged into template list.
		 */
		$new_templates = apply_filters( 'bp_template_hierarchy_activity_directory', array(
			'activity/index-directory.php'
		) );

		// Merge new templates with existing stack
		// @see bp_get_theme_compat_templates().
		$templates = array_merge( (array) $new_templates, $templates );

		return $templates;
	}