diff --git a/CHANGELOG.md b/CHANGELOG.md
index 622dcfd..a5fb1e3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,7 @@ Changelog
 =========
 
 Version 0.3
--------------
+-----------
 * add function `get_serialnumber` (return device serial number)
 * add function `delete_user` (delete specific user by uid)
 * add function `clear_data` (format device)
@@ -10,11 +10,11 @@ Version 0.3
 * add function `clear_attendance` (clear all attendance records)
 
 Version 0.2
--------------
+------------
 * add basic function and program fundamental
 * configure pypi
 * configure travis-ci integration
 
 Version 0.1
--------------
+-----------
 * project initialization