diff --git a/htdocs/product/class/product.class.php b/htdocs/product/class/product.class.php
index 16c72297e10..202e85d7b89 100644
--- a/htdocs/product/class/product.class.php
+++ b/htdocs/product/class/product.class.php
@@ -14,7 +14,7 @@
  * Copyright (C) 2014		Ion agorria			    <ion@agorria.com>
  * Copyright (C) 2016-2018	Ferran Marcet			<fmarcet@2byte.es>
  * Copyright (C) 2017		Gustavo Novaro
- * Copyright (C) 2019-2020  Frédéric France         <frederic.france@netlogic.fr>
+ * Copyright (C) 2019-2021  Frédéric France         <frederic.france@netlogic.fr>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -372,6 +372,9 @@ class Product extends CommonObject
 
 	public $oldcopy;
 
+	/**
+	 * @var int Default warehouse Id
+	 */
 	public $fk_default_warehouse;
 	/**
 	 * @var int ID
@@ -388,6 +391,10 @@ class Product extends CommonObject
 	 * @see        $ref_supplier
 	 */
 	public $ref_fourn;
+
+	/**
+	 * @var string ref supplier
+	 */
 	public $ref_supplier;
 
 	/**