diff --git a/protos/stationLayoutGraphics.proto b/protos/stationLayoutGraphics.proto
index 1ffbb38..94a31c5 100644
--- a/protos/stationLayoutGraphics.proto
+++ b/protos/stationLayoutGraphics.proto
@@ -218,6 +218,7 @@ message PathLine {
   repeated Point points = 3;
   bool isUp = 4;
   repeated KilometerPoint kilometerPoints = 5;
+  bool aToB = 6;
 }
 
 //关联设备