diff --git a/README.md b/README.md
index 51b61be..e8821a6 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ This is my repository for the BUPT-Homework project.
 #### Root directory:
 
 - problem sets
-- random files I edit while on class
+- random files I edit while in class
 
 #### psets