diff --git a/product/ERP5/Document/Delivery.py b/product/ERP5/Document/Delivery.py
index c2b873942a70f1fd487434f24485df2e14d6c7eb..c4966d4778af02eaf9e86a0093a786cb562d33b5 100644
--- a/product/ERP5/Document/Delivery.py
+++ b/product/ERP5/Document/Delivery.py
@@ -120,6 +120,9 @@ class Delivery(XMLObject, ImmobilisationDelivery):
         if the `fast` argument is set to a true value, then it use
         SQLCatalog to compute the price, otherwise it sums the total
         price of objects one by one.
+
+        So if the order is not in the catalog, getTotalPrice(fast=1)
+        will return 0, this is not a bug.
       """
       if not fast :
         kw.setdefault( 'portal_type',
@@ -140,6 +143,9 @@ class Delivery(XMLObject, ImmobilisationDelivery):
         if the `fast` argument is set to a true value, then it use
         SQLCatalog to compute the quantity, otherwise it sums the total
         quantity of objects one by one.
+
+        So if the order is not in the catalog, getTotalQuantity(fast=1)
+        will return 0, this is not a bug.
       """
       if not fast :
         kw.setdefault('portal_type',