diff --git a/business/model/act.go b/business/model/act.go
index 3003d0792..7ec50adbe 100644
--- a/business/model/act.go
+++ b/business/model/act.go
@@ -9,8 +9,9 @@ import (
 const (
 	ActTypeAll       = -1
 	ActSkuFake       = 0 // 假活动，只用于存储活动结算信息
-	ActSkuDirectDown = 3 // 兼容之前的
-	ActSkuSecKill    = 4 // 兼容之前的
+	ActSkuDirectDown = 3 // 直降
+	ActSkuSecKill    = 4 // 秒杀
+	ActSkuDiscount   = 5 // 折扣
 
 	ActOrderBegin               = 10
 	ActOrderMoneyOff            = 11