diff --git a/homework/2/17.py b/homework/2/17.py
index b3d6b14..43837df 100644
--- a/homework/2/17.py
+++ b/homework/2/17.py
@@ -2,6 +2,7 @@ n= int (input())
 x= []
 for i in range(n):
     x.append(input().split()[0])
+    # 0表示只保留第一个元素，舍弃后两个
 s= input()
 for i in range(n):
     if(s==x[i]):