diff --git a/addons/sale/sale.py b/addons/sale/sale.py
index 6a5b430b701..20a9df26fc7 100644
--- a/addons/sale/sale.py
+++ b/addons/sale/sale.py
@@ -861,7 +861,8 @@ class sale_order_line(osv.osv):
         'price_unit': fields.float('Unit Price', required=True, digits_compute= dp.get_precision('Sale Price'), readonly=True, states={'draft': [('readonly', False)]}),
         'price_subtotal': fields.function(_amount_line, string='Subtotal', digits_compute= dp.get_precision('Sale Price')),
         'tax_id': fields.many2many('account.tax', 'sale_order_tax', 'order_line_id', 'tax_id', 'Taxes', readonly=True, states={'draft': [('readonly', False)]}),
-        'type': fields.selection([('make_to_stock', 'from stock'), ('make_to_order', 'on order')], 'Procurement Method', required=True, readonly=True, states={'draft': [('readonly', False)]}),
+        'type': fields.selection([('make_to_stock', 'from stock'), ('make_to_order', 'on order')], 'Procurement Method', required=True, readonly=True, states={'draft': [('readonly', False)]},
+            help="If 'on order', it triggers a procurement when the sale order is confirmed to create a task, purchase order or manufacturing order linked to this sale order line."),
         'property_ids': fields.many2many('mrp.property', 'sale_order_line_property_rel', 'order_id', 'property_id', 'Properties', readonly=True, states={'draft': [('readonly', False)]}),
         'address_allotment_id': fields.many2one('res.partner.address', 'Allotment Partner'),
         'product_uom_qty': fields.float('Quantity (UoM)', digits=(16, 2), required=True, readonly=True, states={'draft': [('readonly', False)]}),