diff --git a/solutions/230. Kth Smallest Element in a BST.md b/solutions/230. Kth Smallest Element in a BST.md
index 3dde8ae..835d327 100644
--- a/solutions/230. Kth Smallest Element in a BST.md	
+++ b/solutions/230. Kth Smallest Element in a BST.md	
@@ -1,4 +1,4 @@
-# [30. Kth Smallest Element in a BST](https://leetcode.com/problems/kth-smallest-element-in-a-bst/)
+# [230. Kth Smallest Element in a BST](https://leetcode.com/problems/kth-smallest-element-in-a-bst/)
 
 # 思路
 题意要求返回一棵二叉搜索树中第k大的元素。