diff --git a/protos/stationLayoutGraphics.proto b/protos/stationLayoutGraphics.proto
index 3db3dc1..5732679 100644
--- a/protos/stationLayoutGraphics.proto
+++ b/protos/stationLayoutGraphics.proto
@@ -216,9 +216,9 @@ message PathLine {
   CommonInfo common = 1;
   string code = 2;
   repeated Point points = 3;
-  bool isUp = 4;
-  repeated KilometerPoint kilometerPoints = 5;
-  bool aToB = 6;
+  bool isUp = 4; // 是否上行
+  repeated KilometerPoint kilometerPoints = 5; // 车站对应的公里标以及坐标点
+  bool isKmIncrease = 6; // 运行方向是否公里标递增
 }
 
 //关联设备