diff --git a/sale.py b/sale.py
index 3e79ed3..7040d56 100644
--- a/sale.py
+++ b/sale.py
@@ -17,7 +17,8 @@ class Sale(metaclass=PoolMeta):
         Monetary(
             "Total Discount", digits='currency', currency='currency'),
         'get_amount')
-    total_discount_cache = fields.Numeric("Total Discount cache", digits='currency')
+    total_discount_cache = fields.Numeric(
+        "Total Discount cache", digits='currency')
 
     @classmethod
     def __setup__(cls):