From b701132c4c1ed48d14971b6a9dd9a6aeff3d427d Mon Sep 17 00:00:00 2001
From: youngyangyang04 <826123027@qq.com>
Date: Sun, 7 Feb 2021 17:35:16 +0800
Subject: [PATCH] Update

---
 README.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/README.md b/README.md
index 3bb75b7b..dc00ecc4 100644
--- a/README.md
+++ b/README.md
@@ -84,6 +84,7 @@
 
 本资源由代码随想录出品：
 
+* [二叉树学习手册开放下载！！](https://mp.weixin.qq.com/s/uSyeCq0UF6kwRKcWkLnXuw)
 * [回溯算法学习手册开放下载！！](https://mp.weixin.qq.com/s/aSToAWOPnPV4GiDf9n0p-w)
 
 （将陆续整理各个专题的PDF下载版本）