diff --git a/server/AyaNova/biz/WorkOrderBiz.cs b/server/AyaNova/biz/WorkOrderBiz.cs
index 4fb1157c..16a6aa5b 100644
--- a/server/AyaNova/biz/WorkOrderBiz.cs
+++ b/server/AyaNova/biz/WorkOrderBiz.cs
@@ -1765,8 +1765,12 @@ namespace AyaNova.Biz
                     }
 
                     //Contract
-                    //todo: need to have a bombproof way to get the effective contract and statically hold it here in wobiz until processing finished because other objects in tree may also need it
-                    //figure out if there will only ever be ONE effective contract or multiple and then can determine how to handle here
+                    todo: need to have a bombproof way to get the effective contract and statically hold it here in wobiz until processing finished because other objects in tree may also need it
+                    figure out if there will only ever be ONE effective contract or multiple and then can determine how to handle here
+                    //Yes precedence is Unit->Customer->headoffice.
+                    //it's not permitted to have more than one contracted unit on a workorder
+                    //if a unit has a contract on workorder it applies to *entire* workorder so they must use one unit under contract and it's the entirety of the work performed
+                    //if they don't want the rest of wo to be discounted etc
                     break;
                 case AyaEvent.Modified: