diff --git a/diy.py b/diy.py
index c3eeb52..25a7717 100644
--- a/diy.py
+++ b/diy.py
@@ -3,7 +3,7 @@
 cost= {'苹果':5.2,'山竹':12.9,'香蕉':2.4,'荔枝':15,'葡萄':9.3,'桂圆':8,'蓝莓':10,'李子':8}
 k=input('请输入水果名称：')
 v=input('请输入水果价钱：')
-# 补充条件判断:
+if k in cost:#补充条件判断:
     if int(v)<cost[k]:
         # 更新价钱
         print(k+'降价了，现价'+v+'元')