diff --git a/Two_Pointers/015.3Sum/Readme.md b/Two_Pointers/015.3Sum/Readme.md
index 39aa5b10f..ce9ffe746 100644
--- a/Two_Pointers/015.3Sum/Readme.md
+++ b/Two_Pointers/015.3Sum/Readme.md
@@ -13,7 +13,7 @@
 while (left<right && nums[left]==nums[left-1]) left++;
 while (left<right && nums[right]==nums[right+1]) right--;
 }
- ```
+```
 2. 对于最外层的循环,也是确定一个,先展开内层循环,再略过最外层的重复项。
 ```cpp
 for (int a=0; a<nums.size(); a++)
@@ -21,6 +21,6 @@
 inner loop;
 while (nums[a]==nums[a+1]) a++;
 }
+```
 
-
-[Leetcode Link](https://leetcode.com/problems/3sum)
\ No newline at end of file
+[Leetcode Link](https://leetcode.com/problems/3sum)
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