diff --git a/problems/0404.左叶子之和.md b/problems/0404.左叶子之和.md
index e6a6682b..aa758367 100644
--- a/problems/0404.左叶子之和.md
+++ b/problems/0404.左叶子之和.md
@@ -340,6 +340,7 @@ var sumOfLeftLeaves = function(root) {
 
 
 
+
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 * 作者微信：[程序员Carl](https://mp.weixin.qq.com/s/b66DFkOp8OOxdZC_xLZxfw)
 * B站视频：[代码随想录](https://space.bilibili.com/525438321)