diff --git a/Livox-Viewer.md b/Livox-Viewer.md
index 03ffed2..8982298 100644
--- a/Livox-Viewer.md
+++ b/Livox-Viewer.md
@@ -1,6 +1,6 @@
 # 1. Color Coding Strategy
 
-## a. Reflectivity:
+## 1.1. Reflectivity:
 
 ```
   if (cur_reflectivity < 30)
@@ -29,7 +29,7 @@
   }
 ```
 
-## b. Depth:
+## 1.2. Depth:
 
 ```
   if (cur_depth < 0){