diff --git a/Classes/Domain/Model/Order/Product.php b/Classes/Domain/Model/Order/Product.php
index cd9dc06b..6a9eef18 100644
--- a/Classes/Domain/Model/Order/Product.php
+++ b/Classes/Domain/Model/Order/Product.php
@@ -50,6 +50,9 @@ class Product extends AbstractEntity
     #[Validate(['validator' => 'NotEmpty'])]
     protected float $tax = 0.0;
 
+    /**
+     * @var string don't remove, it's necessary for extbase database mapping
+     */
     protected string $additionalData = '';
 
     /**
diff --git a/Classes/Domain/Model/Order/ProductAdditional.php b/Classes/Domain/Model/Order/ProductAdditional.php
index 2361330a..78da1047 100644
--- a/Classes/Domain/Model/Order/ProductAdditional.php
+++ b/Classes/Domain/Model/Order/ProductAdditional.php
@@ -14,6 +14,9 @@
 
 class ProductAdditional extends AbstractEntity
 {
+    /**
+     * @var string don't remove, it's necessary for extbase database mapping
+     */
     protected string $additional;
 
     public function __construct(
diff --git a/Documentation/guides.xml b/Documentation/guides.xml
index 6771e35d..4b7b4536 100644
--- a/Documentation/guides.xml
+++ b/Documentation/guides.xml
@@ -11,7 +11,7 @@
                interlink-shortcode="extcode/cart"
     />
     <project title="Cart"
-             release="11.4.1"
+             release="11.4.2"
              version="11.4"
              copyright="2018 - 2025"
     />
diff --git a/ext_emconf.php b/ext_emconf.php
index a0268e3b..4fd5a06a 100644
--- a/ext_emconf.php
+++ b/ext_emconf.php
@@ -4,7 +4,7 @@
     'title' => 'Cart',
     'description' => 'Shopping Cart(s) for TYPO3',
     'category' => 'plugin',
-    'version' => '11.4.1',
+    'version' => '11.4.2',
     'state' => 'stable',
     'author' => 'Daniel Gohlke',
     'author_email' => 'ext@extco.de',