function bp_groups_format_activity_action_group_details_updated( $action, $activity ) {
	$user_link = bp_core_get_userlink( $activity->user_id );

	$group      = bp_groups_get_activity_group( $activity->item_id );
	$group_link = '<a href="' . esc_url( bp_get_group_permalink( $group ) ) . '">' . esc_html( $group->name ) . '</a>';

	/*
	 * Changed group details are stored in groupmeta, keyed by the activity
	 * timestamp. See {@link bp_groups_group_details_updated_add_activity()}.
	 */
	$changed = groups_get_groupmeta( $activity->item_id, 'updated_details_' . $activity->date_recorded );

	// No changed details were found, so use a generic message.
	if ( empty( $changed ) ) {
		$action = sprintf( esc_html__( '%1$s updated details for the group %2$s', 'buddypress' ), $user_link, $group_link );

	// Name and description changed - to keep things short, don't describe changes in detail.
	} elseif ( isset( $changed['name'] ) && isset( $changed['description'] ) ) {
		$action = sprintf( esc_html__( '%1$s changed the name and description of the group %2$s', 'buddypress' ), $user_link, $group_link );

	// Name only.
	} elseif ( ! empty( $changed['name']['old'] ) && ! empty( $changed['name']['new'] ) ) {
		$action = sprintf( esc_html__( '%1$s changed the name of the group %2$s from "%3$s" to "%4$s"', 'buddypress' ), $user_link, $group_link, esc_html( $changed['name']['old'] ), esc_html( $changed['name']['new'] ) );

	// Description only.
	} elseif ( ! empty( $changed['description']['old'] ) && ! empty( $changed['description']['new'] ) ) {
		$action = sprintf( esc_html__( '%1$s changed the description of the group %2$s from "%3$s" to "%4$s"', 'buddypress' ), $user_link, $group_link, esc_html( $changed['description']['old'] ), esc_html( $changed['description']['new'] ) );

	} elseif ( ! empty( $changed['slug']['old'] ) && ! empty( $changed['slug']['new'] ) ) {
		$action = sprintf( esc_html__( '%1$s changed the permalink of the group %2$s.', 'buddypress' ), $user_link, $group_link );

	}

	/**
	 * Filters the 'group_details_updated' activity actions.
	 *
	 * @since 2.0.0
	 *
	 * @param string $action   The 'group_details_updated' activity actions.
	 * @param object $activity Activity data object.
	 */
	return apply_filters( 'bp_groups_format_activity_action_joined_group', $action, $activity );
}