diff --git a/src/solution/Solution.java b/src/solution/Solution.java
index 9627875..0781b92 100644
--- a/src/solution/Solution.java
+++ b/src/solution/Solution.java
@@ -6,6 +6,8 @@ import java.util.Map;
 import java.util.Set;
 
 public class Solution {
+
+    //
     public int lengthOfLongestSubstring(String s) {
         // 哈希集合，记录每个字符是否出现过
         Set<Character> occ = new HashSet<Character>();