diff --git a/classes/stock/StockManagerInterface.php b/classes/stock/StockManagerInterface.php
index 9fbdf99e3..0cb89b964 100644
--- a/classes/stock/StockManagerInterface.php
+++ b/classes/stock/StockManagerInterface.php
@@ -44,7 +44,7 @@ interface StockManagerInterface
 	 *
 	 * @param int $id_product
 	 * @param int id_product_attribute
-	 * @param int $id_warehouse
+	 * @param Warehouse $warehouse
 	 * @param int $quantity
 	 * @param int $id_stock_mouvement_reason
 	 * @param float $price_te
@@ -52,31 +52,31 @@ interface StockManagerInterface
 	 * @param int $id_supplier_order Optionnal
 	 * @return bool
 	 */
-	public function addProduct($id_product, $id_product_attribute, $id_warehouse, $quantity, $id_stock_mouvement_reason, $price_te, $is_usable, $id_supplier_order = null);
+	public function addProduct($id_product, $id_product_attribute, $warehouse, $quantity, $id_stock_mouvement_reason, $price_te, $is_usable, $id_supplier_order = null);
 
 	/**
 	 * For a given product, removes a given quantity
 	 *
 	 * @param int $id_product
 	 * @param int id_product_attribute
-	 * @param int $id_warehouse
+	 * @param Warehouse $warehouse
 	 * @param int $quantity
 	 * @param int $id_stock_mouvement_reason
 	 * @param int $id_order Optionnal
 	 * @return bool
 	 */
-	public function removeProduct($id_product, $id_product_attribute, $id_warehouse, $quantity, $id_stock_mouvement_reason, $id_order = null);
+	public function removeProduct($id_product, $id_product_attribute, $warehouse, $quantity, $id_stock_mouvement_reason, $id_order = null);
 
 	/**
 	 * For a given product, returns its physical quantity
 	 *
 	 * @param int $id_product
 	 * @param int $id_product_attribute
-	 * @param int $id_warehouse Optionnal
+	 * @param Warehouse $warehouse Optional
 	 * @param bool $usable false default - in this case we retrieve all physical quantities, otherwise we retrieve physical quantities flagged as usable
 	 * @return int
 	 */
-	public function getProductPhysicalQuantities($id_product, $id_product_attribute, $id_warehouse = null, $usable = false);
+	public function getProductPhysicalQuantities($id_product, $id_product_attribute, $warehouse = null, $usable = false);
 
 	/**
 	 * For a given product, returns its real quantity
@@ -86,10 +86,10 @@ interface StockManagerInterface
 	 * @param int $id_product
 	 * @param int $id_product_attribute
 	 * @param bool $usable false by default
-	 * @param int $id_warehouse Optionnal
+	 * @param Warehouse $warehouse Optional
 	 * @return int
 	 */
-	public function getProductRealQuantities($id_product, $id_product_attribute, $id_warehouse = null, $usable = false);
+	public function getProductRealQuantities($id_product, $id_product_attribute, $warehouse = null, $usable = false);
 
 	/**
 	 * For a given product, transfers quantities between two warehouses
@@ -100,12 +100,12 @@ interface StockManagerInterface
 	 * @param int $id_product
 	 * @param int $id_product_attribute
 	 * @param int $quantity
-	 * @param int $id_warehouse_from
-	 * @param int $id_warehouse_to
+	 * @param Warehouse $warehouse_from
+	 * @param Warehouse $warehouse_to
 	 * @param bool $usable_from true by default
 	 * @param bool $usable_to true by default
 	 * @return bool
 	 */
-	public function transferBetweenWarehouses($id_product, $id_product_attribute, $quantity, $id_warehouse_from, $id_warehouse_to, $usable_from = true, $usable_to = true);
+	public function transferBetweenWarehouses($id_product, $id_product_attribute, $quantity, $warehouse_from, $warehouse_to, $usable_from = true, $usable_to = true);
 
 }
\ No newline at end of file