diff --git a/15lanqiao/test2.cpp b/15lanqiao/test2.cpp
index 4014a75..8ff1de4 100644
--- a/15lanqiao/test2.cpp
+++ b/15lanqiao/test2.cpp
@@ -1,3 +1,4 @@
+// lanqiao19732 小球反弹
 #include<bits/stdc++.h>
 using namespace std;