diff --git a/commerce/README.txt b/commerce/README.txt
index f381c16..2850ae8 100644
--- a/commerce/README.txt
+++ b/commerce/README.txt
@@ -99,7 +99,7 @@ The items in a shopping cart may be included in an order.
   >>> for item in orderItems.getCart(c001):
   ...     item.setOrder(ord001)
 
-Now the default cart is empty; we now have to supply the order for
+Now the default cart is empty; we have to supply the order for
 retrieving the order items.
 
   >>> orderItems.getCart(c001)
diff --git a/commerce/configure.zcml b/commerce/configure.zcml
index 14dd1d6..4e151ad 100644
--- a/commerce/configure.zcml
+++ b/commerce/configure.zcml
@@ -8,4 +8,6 @@
 
   <i18n:registerTranslations directory="locales" />
 
+  <zope:adapter factory="cybertools.commerce.order.OrderItems" />
+
 </configure>
diff --git a/commerce/interfaces.py b/commerce/interfaces.py
index 8106fb1..aa0a942 100644
--- a/commerce/interfaces.py
+++ b/commerce/interfaces.py
@@ -371,6 +371,6 @@ class IOrderItems(Interface):
             may be specified via keyword arguments.
         """
 
-    def getCart(party, order='???', shop=None, run=0, **kw):
+    def getCart(party=None, order='???', shop=None, run=0, **kw):
         """ Return a collection of order items.
         """
diff --git a/commerce/order.py b/commerce/order.py
index 4dff4b8..c26c2b9 100644
--- a/commerce/order.py
+++ b/commerce/order.py
@@ -116,7 +116,7 @@ class OrderItems(object):
         self.context.indexTrack(0, track, 'order')
         return track
 
-    def getCart(self, party, order='???', shop=None, run=None, **kw):
+    def getCart(self, party=None, order='???', shop=None, run=None, **kw):
         if run:
             kw['run'] = run
         result = self.query(party=party, order=order, **kw)