diff --git a/docs/操作系统/CS162.en.md b/docs/操作系统/CS162.en.md
index 4c338663..5a0577c2 100644
--- a/docs/操作系统/CS162.en.md
+++ b/docs/操作系统/CS162.en.md
@@ -25,7 +25,7 @@ Although it is tough, Stanford, Berkeley, JHU and many other top U.S. colleges h
 - Course Website: <https://cs162.org/>
 - Lecture Videos: <https://www.youtube.com/watch?v=YfHY0pvpRkk>, videos for each lecture can be found on the course website.
 - Textbook: [Operating Systems: Principles and Practice (2nd Edition)](http://ospp.cs.washington.edu/)
-- Assignments: <https://cs162.org/>, 6 Homework, 3 Projects, the course website has specific requirements
+- Assignments: <https://cs162.org/>, 6 Homework, 3 Projects, the course website has specific requirements.
 
 ## Personal Resources