diff --git a/protos/stationLayoutGraphics.proto b/protos/stationLayoutGraphics.proto
index 6ad0298..2f31fe1 100644
--- a/protos/stationLayoutGraphics.proto
+++ b/protos/stationLayoutGraphics.proto
@@ -156,7 +156,7 @@ message Turnout {//(后端不关注)
 }
 
 message KilometerSystem {
-  int64 kilometer = 1;  //公里标cm
+  int64 kilometer = 1;  //公里标mm
   string coordinateSystem = 2; //坐标系
 }