diff --git a/notes/55.1 二叉树的深度.md b/notes/55.1 二叉树的深度.md
index 81d9e394..09c7434f 100644
--- a/notes/55.1 二叉树的深度.md	
+++ b/notes/55.1 二叉树的深度.md	
@@ -1,6 +1,6 @@
 # 55.1 二叉树的深度
 
-[NowCoder](https://www.nowcoder.com/practice/435fb86331474282a3499955f0a41e8b?tpId=13&tqId=11191&tPage=1&rp=1&ru=/ta/coding-interviews&qru=/ta/coding-interviews/question-ranking&from=cyc_github)
+[Leetcode](https://leetcode.cn/problems/er-cha-shu-de-shen-du-lcof/)
 
 ## 题目描述
 
@@ -11,7 +11,7 @@
 ## 解题思路
 
 ```java
-public int TreeDepth(TreeNode root) {
-    return root == null ? 0 : 1 + Math.max(TreeDepth(root.left), TreeDepth(root.right));
+public int calculateDepth(TreeNode root) {
+    return root == null ? 0 : 1 + Math.max(calculateDepth(root.left), calculateDepth(root.right));
 }
 ```