diff --git a/protos/device_state.proto b/protos/device_state.proto
index e9b2c5f..81d4833 100644
--- a/protos/device_state.proto
+++ b/protos/device_state.proto
@@ -131,7 +131,7 @@ message TrainState{
   float speed = 3;
   //列车长度,1=1mm
   int64 trainLength = 4;
-  //列车是否显示
+  //列车是否显示（此状态仅在列车被删除时为false，若需更改用途需增加列车被删除状态）
   bool show = 5;
   // 列车车头所在设备ID
   uint32 headDeviceId = 6;