diff --git a/libraries/AP_Logger/LogStructure.h b/libraries/AP_Logger/LogStructure.h
index 4fcb6b4b3f..af8c2a2732 100644
--- a/libraries/AP_Logger/LogStructure.h
+++ b/libraries/AP_Logger/LogStructure.h
@@ -742,6 +742,7 @@ struct PACKED log_VER {
 // @Field: U: True if sensor is being used
 // @Field: H: True if sensor is healthy
 // @Field: Hp: Probability sensor is healthy
+// @Field: TR: innovation test ratio
 // @Field: Pri: True if sensor is the primary sensor
 
 // @LoggerMessage: CMD