diff --git a/libraries/AP_Logger/LogStructure.h b/libraries/AP_Logger/LogStructure.h
index 8f6192fa06..3fc55f0101 100644
--- a/libraries/AP_Logger/LogStructure.h
+++ b/libraries/AP_Logger/LogStructure.h
@@ -1589,9 +1589,9 @@ struct PACKED log_Arm_Disarm {
 // @Field: Lat: latitude
 // @Field: Lng: longitude
 // @Field: Alt: altitude
-// @Field: Spd: speed
+// @Field: Spd: ground speed
 // @Field: GCrs: ground course
-// @Field: VZ: vertical velocity
+// @Field: VZ: vertical speed
 // @Field: Yaw: vehicle yaw
 // @Field: U: boolean value indicating whether this GPS is in use