diff --git a/libraries/mogo-adas-data/src/main/proto/traffic_light.proto b/libraries/mogo-adas-data/src/main/proto/traffic_light.proto
index b557af6397..04e591286c 100644
--- a/libraries/mogo-adas-data/src/main/proto/traffic_light.proto
+++ b/libraries/mogo-adas-data/src/main/proto/traffic_light.proto
@@ -12,7 +12,7 @@ enum LightType {
 }
 
 enum LightState {
-  STATE_OFF = 0;
+  STATE_OFF = 0;//没检测到灯
   STATE_RED = 1;
   STATE_YELLOW = 2;
   STATE_GREEN = 3;