diff --git a/installer/data/mysql/kohastructure.sql b/installer/data/mysql/kohastructure.sql
index 370a2a4269..d0ebda9520 100644
--- a/installer/data/mysql/kohastructure.sql
+++ b/installer/data/mysql/kohastructure.sql
@@ -1051,13 +1051,13 @@ CREATE TABLE `items` (
 --
 
 DROP TABLE IF EXISTS `itemtypes`;
-CREATE TABLE `itemtypes` (
-  `itemtype` varchar(10) NOT NULL default '',
-  `description` mediumtext,
-  `rentalcharge` double(16,4) default NULL,
-  `notforloan` smallint(6) default NULL,
-  `imageurl` varchar(200) default NULL,
-  `summary` text,
+CREATE TABLE `itemtypes` ( -- defines the item types
+  `itemtype` varchar(10) NOT NULL default '', -- unique key, a code associated with the item type
+  `description` mediumtext, -- a plain text explanation of the item type
+  `rentalcharge` double(16,4) default NULL, -- the amount charged when this item is checked out/issued
+  `notforloan` smallint(6) default NULL, -- 1 if the item is not for loan, 0 if the item is available for loan
+  `imageurl` varchar(200) default NULL, -- URL for the item type icon
+  `summary` text, -- information from the summary field, may include HTML
   PRIMARY KEY  (`itemtype`),
   UNIQUE KEY `itemtype` (`itemtype`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;