diff --git a/High-Performance-Order-Storage-Upgrade-Recipe-Book.md b/High-Performance-Order-Storage-Upgrade-Recipe-Book.md
index 980a43b..857ff35 100644
--- a/High-Performance-Order-Storage-Upgrade-Recipe-Book.md
+++ b/High-Performance-Order-Storage-Upgrade-Recipe-Book.md
@@ -219,4 +219,4 @@ add_action( 'before_woocommerce_init', function() {
 If you prefer to include the compatibility declaration outside of your main plugin file, please pass 'my-plugin-slug/my-plugin.php' instead of the `__FILE__` parameter in the snippets above.
 
 To prevent problems, WooCommerce will warn users if they try to enable HPOS while any of the incompatible plugins are active. It will also display a warning in the Plugins screen to make sure people would know if extension is incompatible. 
-As many WordPress extensions aren't WooCommerce related, WC will only display this information for extensions that declare `WC tested up to` in their readme file.
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+As many WordPress extensions aren't WooCommerce related, WC will only display this information for extensions that declare `WC tested up to` in the header of the main plugin file.
\ No newline at end of file