add_action( 'pre_get_posts', 'be_change_lsu_posts_per_page' );
/**
 * Change Posts Per Page for Lower School Update category.
 * 
 * @author Bill Erickson
 * @link http://www.billerickson.net/customize-the-wordpress-query/
 * @param object $query data
 *
 */
function be_change_lsu_posts_per_page( $query ) {
	if ( $query->is_main_query() && ! is_admin() && is_category( 'lower-school-update' ) ) {
		$query->set( 'posts_per_page', '1' );
	}
}