diff --git a/2.1 高效学习/README.md b/2.1 高效学习/README.md
index a4941f8..1d695ae 100644
--- a/2.1 高效学习/README.md	
+++ b/2.1 高效学习/README.md	
@@ -1,5 +1,8 @@
 短链接：http://33h.co/e2D5
 
+[社会分层](https://www.zhihu.com/question/391671684/answer/1201494550)
+
+---
 
 ### 背书写字
 
@@ -16,6 +19,7 @@
 * [Topbook的回答 康纳尔笔记法](https://www.zhihu.com/question/50343728/answer/554529926)
 * [你有什么值得分享的高效学习方法？（习惯养成计划制定）](https://www.zhihu.com/question/50343728/answer/228142789)
 * [Heisenberg的回答-启发式习惯，非绝对坚持](https://www.zhihu.com/question/50343728/answer/611428233)
+* [超强的学习能力是怎样练就的？](https://www.zhihu.com/question/35103080/answer/802025901)
 
 ### 应试战术