diff --git a/README.md b/README.md
index b26e546..cc6a77d 100644
--- a/README.md
+++ b/README.md
@@ -193,7 +193,7 @@ voidSortbyScore(STU stu[],int n,int m,int(*compare)(float a,float b))
 ```
 int Ascending(float a,float b)
 {
-
+        return a < b;    //这样比较决定了按升序排序，如果a<b，则交换
 }
 ```