diff --git a/initdb/02_1_1_signalk_api_tables.sql b/initdb/02_1_1_signalk_api_tables.sql
index 8004691..d97b0b4 100644
--- a/initdb/02_1_1_signalk_api_tables.sql
+++ b/initdb/02_1_1_signalk_api_tables.sql
@@ -121,14 +121,14 @@ CREATE TABLE IF NOT EXISTS api.logbook(
   max_speed DOUBLE PRECISION NULL,
   max_wind_speed DOUBLE PRECISION NULL,
   notes TEXT NULL, -- remarks
-  extra JSONB NULL -- other signalk metrics of interest
+  extra JSONB NULL -- computed signalk metrics of interest
 );
 -- Description
 COMMENT ON TABLE
     api.logbook
     IS 'Stores generated logbook';
 COMMENT ON COLUMN api.logbook.distance IS 'in NM';
-COMMENT ON COLUMN api.logbook.extra IS 'other metrics of interest, runTime, currentLevel, etc';
+COMMENT ON COLUMN api.logbook.extra IS 'computed signalk metrics of interest, runTime, currentLevel, etc';
 
 -- Index todo!
 CREATE INDEX logbook_vessel_id_idx ON api.logbook (vessel_id);