diff --git a/modules/ppcp-settings/src/Data/SettingsModel.php b/modules/ppcp-settings/src/Data/SettingsModel.php
index b88a899d3..0e9e8e706 100644
--- a/modules/ppcp-settings/src/Data/SettingsModel.php
+++ b/modules/ppcp-settings/src/Data/SettingsModel.php
@@ -73,7 +73,7 @@ class SettingsModel extends AbstractDataModel {
 			// Enum-type string values.
 			'subtotal_adjustment'    => 'skip_details', // Options: [correction|no_details].
 			'landing_page'           => 'any',          // Options: [any|login|guest_checkout].
-			'button_language'        => '',             // empty or a 2-letter language code.
+			'button_language'        => '',             // empty or a language locale code.
 
 			// Boolean flags.
 			'authorize_only'         => false,