diff --git a/solution/0400-0499/0404.Sum of Left Leaves/README_EN.md b/solution/0400-0499/0404.Sum of Left Leaves/README_EN.md
index a402d69f5531d..6c329c4405ef6 100644
--- a/solution/0400-0499/0404.Sum of Left Leaves/README_EN.md	
+++ b/solution/0400-0499/0404.Sum of Left Leaves/README_EN.md	
@@ -213,6 +213,25 @@ int sumOfLeftLeaves(struct TreeNode* root) {
 }
 ```
 
+```cpp
+class Solution {
+ public:
+  int sumOfLeftLeaves(TreeNode* root) {
+    if (root == nullptr)
+      return 0;
+    int ans = 0;
+    if (root->left) {
+      if (root->left->left == nullptr && root->left->right == nullptr)
+        ans += root->left->val;
+      else
+        ans += sumOfLeftLeaves(root->left);
+    }
+    ans += sumOfLeftLeaves(root->right);
+    return ans;
+  }
+};
+```
+
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