diff --git a/TangDou/Topic/【换根DP】专题.md b/TangDou/Topic/【换根DP】专题.md
index 828e39e..4f9eadf 100644
--- a/TangDou/Topic/【换根DP】专题.md
+++ b/TangDou/Topic/【换根DP】专题.md
@@ -1270,6 +1270,7 @@ signed main() {
 ```
 #### [$V-Subtree$](https://www.luogu.com.cn/problem/AT_dp_v)
 https://blog.csdn.net/Emm_Titan/article/details/123875298
+https://blog.csdn.net/2303_76385579/article/details/131923964
 
 **题意**
 给定一棵 $N$ 个节点的树，现在需要将每一个节点染成黑色或白色。