diff --git a/High-Performance-Order-Storage-Upgrade-Recipe-Book.md b/High-Performance-Order-Storage-Upgrade-Recipe-Book.md
index 8726814..00d0748 100644
--- a/High-Performance-Order-Storage-Upgrade-Recipe-Book.md
+++ b/High-Performance-Order-Storage-Upgrade-Recipe-Book.md
@@ -169,7 +169,7 @@ The following snippet shows a way to add meta boxes to the legacy order editor s
 ```php
 use Automattic\WooCommerce\Internal\DataStores\Orders\CustomOrdersTableController;
 
-add_action( 'add_meta_boxes', 'xyz_metabox' );
+add_action( 'add_meta_boxes', 'add_xyz_metabox' );
 
 function add_xyz_metabox() {
 	$screen = wc_get_container()->get( CustomOrdersTableController::class )->custom_orders_table_usage_is_enabled()
@@ -205,7 +205,7 @@ Once you examined the extension's code, you can declare whether it's compatible
 ```php
 
 add_action( 'before_woocommerce_init', function() {
-	if ( class_exists( '\Automattic\WooCommerce\Utilities\FeaturesUtil' ) ) {
+	if ( class_exists( \Automattic\WooCommerce\Utilities\FeaturesUtil::class ) ) {
 		\Automattic\WooCommerce\Utilities\FeaturesUtil::declare_compatibility( 'custom_order_tables', __FILE__, true );
 	}
 } );
@@ -217,7 +217,7 @@ If you know your code doesn't support HPOS, you should declare **incompatibility
 ```php
 
 add_action( 'before_woocommerce_init', function() {
-	if ( class_exists( '\Automattic\WooCommerce\Utilities\FeaturesUtil' ) ) {
+	if ( class_exists( \Automattic\WooCommerce\Utilities\FeaturesUtil::class ) ) {
 		\Automattic\WooCommerce\Utilities\FeaturesUtil::declare_compatibility( 'custom_order_tables', __FILE__, false );
 	}
 } );