diff --git a/doc/Install.md b/doc/Install.md
index a2c9e2e..05ef860 100644
--- a/doc/Install.md
+++ b/doc/Install.md
@@ -43,7 +43,7 @@ Into your CRM settings set path to exported file
 
 ```
 $this->load->model('intarocrm/order');
-$this->model_intarocrm_order->send($this->data, $order_id);
+$this->model_intarocrm_order->send($this->data, $this->session->data['order_id']);
 ```
 
 Add this lines into: