diff --git a/lab1122/note.md b/lab1122/note.md
index 1f1dfb943d38ef030150a9a686e83cfbbf893126..b3c30e16f48a21aa42eb654913cd75c6adc6d777 100644
--- a/lab1122/note.md
+++ b/lab1122/note.md
@@ -1,3 +1,5 @@
 # 1122 Note
 
+## main : learn about branch
+
 ## br_A: AAAA