add some comment

htdocs/product/stock/class/entrepot.class.php

@@ -44,6 +44,9 @@ class Entrepot extends CommonObject
 	 */
 	public $table_element='entrepot';
 
+	/**
+	 * @var string String with name of icon for myobject. Must be the part after the 'object_' into object_myobject.png
+	 */
 	public $picto='stock';
 	public $ismultientitymanaged = 1;	// 0=No test on entity, 1=Test with field entity, 2=Test with link by societe
 

htdocs/product/stock/class/productlot.class.php

@@ -45,6 +45,9 @@ class Productlot extends CommonObject
 	 */
 	public $table_element = 'product_lot';
 
+	/**
+	 * @var string String with name of icon for myobject. Must be the part after the 'object_' into object_myobject.png
+	 */
 	public $picto='barcode';
 
 	/**