diff --git a/problems/0015.三数之和.md b/problems/0015.三数之和.md
index 9875f037..390ce864 100644
--- a/problems/0015.三数之和.md
+++ b/problems/0015.三数之和.md
@@ -218,7 +218,8 @@ class Solution {
 ```
 
 Python：
-```class Solution:
+```Python
+class Solution:
     def threeSum(self, nums):
         ans = []
         n = len(nums)