diff --git a/docs/数据结构与算法/CS61B.en.md b/docs/数据结构与算法/CS61B.en.md
index 9b91c9fc..4751ff68 100644
--- a/docs/数据结构与算法/CS61B.en.md
+++ b/docs/数据结构与算法/CS61B.en.md
@@ -5,7 +5,7 @@
 - Offered by: UC Berkeley
 - Prerequisites: CS61A
 - Programming languages: Java
-- Difficulty:
+- Difficulty: 🌟🌟🌟
 - Class Hour: 60 hours
 
 It is the second course of UC Berkeley's CS61 series. It mainly focuses on the design of data structures and algorithms as well as gives students the opportunity to be exposed to thousands of lines of engineering code and gain a preliminary understanding of software engineering through Java.
@@ -18,12 +18,13 @@ The quality of homework in this class is also unparalleled. The 14 labs will all
 In addition, there are 3 projects that give you the opportunity to be exposed to thousands of lines of engineering code and hone your Java skills in practice.
 
 ## Resources
+## Course Resources
 
 - Homepage: <https://sp18.datastructur.es/>
 - Records: <https://sp18.datastructur.es/>, the link of each lecture is on homepage
 - Textbook: None
 - Assignments: Slightly different every year. In the spring semester of 2018, there are 14 Labs, 10 Homeworks and 3 Projects. Please refer to the course website for specific requirements.
 
-## Gathered resources
+## Personal resources
 
 All resources and homework implementations used by @PKUFlyingPig in taking this course are summarized in [PKUFlyingPig/CS61B - GitHub](https://github.com/PKUFlyingPig/CS61B).