diff --git a/product/ERP5/Document/SupplyChain.py b/product/ERP5/Document/SupplyChain.py
index 3acaca89ce096dac210c96ef473aa8ed42a1ef22..103a17cbeeecfb9221f496980ce1e00c87ed958e 100644
--- a/product/ERP5/Document/SupplyChain.py
+++ b/product/ERP5/Document/SupplyChain.py
@@ -173,6 +173,8 @@ class SupplyChain(Path, XMLObject):
       If recursive, browse the SupplyChain until a valid link is found.
       checked_link_list is used to prevent infinite loop.
     """
+    # XXX document "all" parameter if you can
+
     # Initialize checked_link_list parameter...
     if checked_link_list is None:
       checked_link_list = []