diff --git a/protos/device_state.proto b/protos/device_state.proto
index a89f3f2..63f7820 100644
--- a/protos/device_state.proto
+++ b/protos/device_state.proto
@@ -430,7 +430,7 @@ message TrainDynamicConfigMqtt{
   int32 slide = 11;
   //过标/欠标（mm）（正数过标，负数欠标）
   int32 stopSign=12;
-  //空转
+  //空转 %
   string idling =13 ;
 }
 //列车一端的状态