diff --git a/problems/0226.翻转二叉树.md b/problems/0226.翻转二叉树.md
index 36083dcd..f9185959 100644
--- a/problems/0226.翻转二叉树.md
+++ b/problems/0226.翻转二叉树.md
@@ -565,7 +565,7 @@ var invertTree = function(root) {
 };
 ```
 
-C:
+### C:
 递归法
 ```c
 struct TreeNode* invertTree(struct TreeNode* root){
@@ -582,6 +582,7 @@ struct TreeNode* invertTree(struct TreeNode* root){
     return root;
 }
 ```
+
 迭代法：深度优先遍历
 ```c
 struct TreeNode* invertTree(struct TreeNode* root){