diff --git a/sql.go b/sql.go
index 281d46e..8c6d978 100644
--- a/sql.go
+++ b/sql.go
@@ -58,8 +58,9 @@ func initDB() {
 	failOnError(err, "initDB : create table code_obj_sub_type")
 
 	_, err = db.Exec(`CREATE TABLE obj (
-							 id				BIGINT UNSIGNED NOT NULL AUTO_INCREMENT
-							,obj_type_id	SMALLINT UNSIGNED NOT NULL
+							 id				 BIGINT UNSIGNED NOT NULL AUTO_INCREMENT
+							,obj_type_id	 SMALLINT UNSIGNED NOT NULL
+							,obj_sub_type_id SMALLINT UNSIGNED NOT NULL
 							,PRIMARY KEY (id)
 						  ) ENGINE = InnoDB AUTO_INCREMENT = 0 CHARSET=utf8 COLLATE utf8_unicode_ci;`)
 	failOnError(err, "initDB : create table obj")