diff --git a/lab1122/note.md b/lab1122/note.md
index d3e4f68d35cb19eed95bd220e79b86763cc07ddd..3b8797a9b096300ff601e4a87a6fed590f8b3741 100644
--- a/lab1122/note.md
+++ b/lab1122/note.md
@@ -1 +1,3 @@
 # 1122 Note
+
+## main : learn about branch