diff --git a/product/ERP5/Document/Supply.py b/product/ERP5/Document/Supply.py
index b526d7c9b60e51f735c3460e53ecd3177d396cc6..92265766d2a6ed111b43c6ceb075dff54eb1ab82 100644
--- a/product/ERP5/Document/Supply.py
+++ b/product/ERP5/Document/Supply.py
@@ -26,15 +26,17 @@
 #
 ##############################################################################
 
-from Globals import InitializeClass, PersistentMapping
-from Products.CMFCore.utils import getToolByName
-from Products.CMFCore.WorkflowCore import WorkflowMethod
 from AccessControl import ClassSecurityInfo
 from Products.ERP5Type import Permissions, PropertySheet, Constraint, Interface
 from Products.ERP5Type.XMLObject import XMLObject
 from Products.ERP5.Document.Path import Path
 
-class Supply(Path,XMLObject):
+class Supply(Path, XMLObject):
+    """A Supply defines precise pricing and shipping conditions between
+    two trade parties for a limited selection of traded products,
+    components, services, etc. It can be used to represent price
+    catalogs, product referencing, pricing policy, etc.
+    """
     # CMF Type Definition
     meta_type = 'ERP5 Supply'
     portal_type = 'Supply'