diff --git a/docs/系统安全/MIT6.858.en.md b/docs/系统安全/MIT6.858.en.md
index 0dece033..b0513e1a 100644
--- a/docs/系统安全/MIT6.858.en.md
+++ b/docs/系统安全/MIT6.858.en.md
@@ -24,6 +24,6 @@ In the Final Project, you will build a remote file system, [SecFS](https://www.u
 ## Resources
 
 - Course Website: <http://css.csail.mit.edu/6.858/2022/>
-- Assignments: refer to the course website
+- Assignments: refer to the course website.
 - Textbook: None
 - Assignments:  4 Labs + Final Project / Lab5