diff --git a/uom.py b/uom.py
index 631491f929..67c6e65cd9 100644
--- a/uom.py
+++ b/uom.py
@@ -10,6 +10,7 @@ class UomCategory(OSV):
     _description = __doc__
     _order = 'name'
     name = fields.Char('Name', size=64, required=True)
+    uoms = fields.One2Many('product.uom', 'category', 'Unit of Measures')
 
 UomCategory()