diff --git a/htdocs/install/mysql/tables/llx_product_lot.sql b/htdocs/install/mysql/tables/llx_product_lot.sql
index 52653e2c90a..162f1c6c122 100644
--- a/htdocs/install/mysql/tables/llx_product_lot.sql
+++ b/htdocs/install/mysql/tables/llx_product_lot.sql
@@ -25,9 +25,9 @@ CREATE TABLE llx_product_lot (
   eatby           date DEFAULT NULL,			-- Eatby date
   sellby          date DEFAULT NULL, 			-- Sellby date
   eol_date      datetime NULL,
-  manufacturing_date datetime NULL,
-  scrapping_date datetime NULL,
-  barcode       varchar(180) DEFAULT NULL,          -- barcode
+  manufacturing_date datetime NULL,                -- date when first manufacturing of this lot has started 
+  scrapping_date datetime NULL,                    -- date when we decided to scrap all products of this lot
+  barcode       varchar(180) DEFAULT NULL,         -- barcode
   fk_barcode_type   integer DEFAULT NULL,          -- barcode type
   datec         datetime,
   tms           timestamp DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,