WooCommerce - Show purchase notes on the thank-you page

<?php
  // WooCommerce - Show purchase notes in the thank-you page order details table
  add_filter( 'woocommerce_purchase_note_order_statuses', 'custom_purchase_note_order_statuses' );
  function custom_purchase_note_order_statuses( $statuses ) {
    // default: $statuses = array( 'completed', 'processing' )
    $statuses[] = 'on-hold';
    $statuses[] = 'pending';
    return $statuses;
  }