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 92a72fe3..859df39e 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
@@ -250,22 +250,22 @@ Go：
 
 ```go
 func sumNumbers(root *TreeNode) int {
-	sum = 0
-	travel(root, root.Val)
-	return sum
+    sum := 0
+    dfs(root, root.Val, &sum)
+    return sum
 }
 
-func travel(root *TreeNode, tmpSum int) {
-	if root.Left == nil && root.Right == nil {
-		sum += tmpSum
-	} else {
-		if root.Left != nil {
-			travel(root.Left, tmpSum*10+root.Left.Val)
-		}
-		if root.Right != nil {
-			travel(root.Right, tmpSum*10+root.Right.Val)
-		}
-	}
+func dfs(root *TreeNode, tmpSum int, sum *int) {
+    if root.Left == nil && root.Right == nil {
+        *sum += tmpSum
+    } else {
+        if root.Left != nil {
+            dfs(root.Left, tmpSum*10 + root.Left.Val, sum)
+        }
+        if root.Right != nil {
+            dfs(root.Right, tmpSum*10 + root.Right.Val, sum)
+        }
+    }
 }
 ```