diff --git a/protos/stationLayoutGraphics.proto b/protos/stationLayoutGraphics.proto
index afc60a9..b285076 100644
--- a/protos/stationLayoutGraphics.proto
+++ b/protos/stationLayoutGraphics.proto
@@ -297,6 +297,7 @@ message Signal {
   // 信号机模型类型
   Model mt = 10;
   //string belongStation = 11; // 所属车站(缩写)
+  Direction direction = 12; // 上下行
 }
 
 /** 上下行（区段/信号机） */