diff --git a/htdocs/core/modules/barcode/mod_barcode_product_standard.php b/htdocs/core/modules/barcode/mod_barcode_product_standard.php
index 6be9aa859c3..3149ea9f516 100644
--- a/htdocs/core/modules/barcode/mod_barcode_product_standard.php
+++ b/htdocs/core/modules/barcode/mod_barcode_product_standard.php
@@ -48,8 +48,11 @@ class mod_barcode_product_standard extends ModeleNumRefBarCode
      * @var string
      */
 	public $version = 'dolibarr';    		// 'development', 'experimental', 'dolibarr'
-
-	public $code_auto;                     // Automatic Numbering
+    
+	/**
+	 * @var int Automatic numbering
+	 */
+	public $code_auto;                     
 
 	public $searchcode; // Search string