diff --git a/protos/stationLayoutGraphics.proto b/protos/stationLayoutGraphics.proto
index e98b40a..900b50a 100644
--- a/protos/stationLayoutGraphics.proto
+++ b/protos/stationLayoutGraphics.proto
@@ -354,7 +354,7 @@ message Slope {
 message Curvature {
   CommonInfo common = 1;
   repeated Point points = 2;
-  sint32 curvatureNumber = 3;          //曲线的半径--正代表外侧；负代表内侧
+  sint32 curvatureNumber = 3;          //曲线的半径（mm）--正代表外侧；负代表内侧
   repeated string refDeviceId = 4; // 曲线关联的(曲度公里标)
 }