diff --git a/docs/数学进阶/6.042J.en.md b/docs/数学进阶/6.042J.en.md
index ff20d200..2aec6da1 100644
--- a/docs/数学进阶/6.042J.en.md
+++ b/docs/数学进阶/6.042J.en.md
@@ -8,10 +8,10 @@
 - Difficulty: 🌟🌟🌟
 - Class Hour: 50-70 hours
 
-This Course is MIT discrete mathematics and probability course is taught by the notable Tom Leighton (co-founder of Akamai). The course is very useful for algorithm learning subsequently.
+This Course is MIT discrete mathematics and probability course is taught by the notable Tom Leighton (co-founder of Akamai). The course is very useful for learning algorithm subsequently.
 
 ## Course Resources
 
 - Course Website: <https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-042j-mathematics-for-computer-science-fall-2010/>
-- Recordings: <https://www.bilibili.com/video/BV1L741147VX>
+- Recordings: <https://www.youtube.com/playlist?list=PLB7540DEDD482705B>
 - Assignments: <https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-042j-mathematics-for-computer-science-fall-2010/assignments/>