diff --git a/zh-cn/hardware_vision_scheduling.md b/zh-cn/hardware_vision_scheduling.md
index ac036cf..d8ed99e 100644
--- a/zh-cn/hardware_vision_scheduling.md
+++ b/zh-cn/hardware_vision_scheduling.md
@@ -393,7 +393,8 @@ sequenceDiagram
     "start_distance": 10.5,
     "end_distance": 10.5,
     "length": 4100.0,
-    "saw_thickness": 1.8
+    "saw_thickness": 1.8,
+    "scan_start": "left"
   },
   "timestamp": 1762158534297
 }
@@ -413,6 +414,7 @@ sequenceDiagram
 | right_distance | number | 否 | 原木右端距离       |
 | length | number | 否 | 原木长度           |
 | saw_thickness | number | 否 | 锯片厚度 （锯路）      |
+| scan_start | string | 否 | 初始扫描方向（left或right） |
 
 **响应示例：**
 ```json