diff --git a/problems/0129.求根到叶子节点数字之和.md b/problems/0129.求根到叶子节点数字之和.md
index 859df39e..bd5107a2 100644
--- a/problems/0129.求根到叶子节点数字之和.md
+++ b/problems/0129.求根到叶子节点数字之和.md
@@ -320,8 +320,11 @@ TypeScript：
 ```typescript
 function sumNumbers(root: TreeNode | null): number {
     if (root === null) return 0;
+    // 记录最终结果
     let resTotal: number = 0;
+    // 记录路径中遇到的节点值
     const route: number[] = [];
+    // 递归初始值
     route.push(root.val);
     recur(root, route);
     return resTotal;
@@ -342,6 +345,7 @@ function sumNumbers(root: TreeNode | null): number {
         };
     }
     function listToSum(nums: number[]): number {
+        // 数组求和
         return Number(nums.join(''));
     }
 };