diff --git a/htdocs/install/mysql/migration/5.0.0-6.0.0.sql b/htdocs/install/mysql/migration/5.0.0-6.0.0.sql
index f418a5e6a1f..1994fb10c37 100644
--- a/htdocs/install/mysql/migration/5.0.0-6.0.0.sql
+++ b/htdocs/install/mysql/migration/5.0.0-6.0.0.sql
@@ -70,6 +70,10 @@ ALTER TABLE llx_extrafields ADD COLUMN fielddefault varchar(255);
 ALTER TABLE llx_c_typent MODIFY COLUMN libelle varchar(64); 
 
 
+ALTER TABLE llx_holiday ADD COLUMN ref	varchar(30) NULL;
+ALTER TABLE llx_holiday ADD COLUMN ref_ext	varchar(255);
+
+
 create table llx_notify_def_object
 (
   id				integer AUTO_INCREMENT PRIMARY KEY,
diff --git a/htdocs/install/mysql/tables/llx_holiday.sql b/htdocs/install/mysql/tables/llx_holiday.sql
index 2091dea9541..35982525853 100644
--- a/htdocs/install/mysql/tables/llx_holiday.sql
+++ b/htdocs/install/mysql/tables/llx_holiday.sql
@@ -19,6 +19,8 @@
 CREATE TABLE llx_holiday 
 (
 rowid          integer NOT NULL AUTO_INCREMENT PRIMARY KEY,
+ref			   varchar(30) NOT NULL,       -- number
+ref_ext		   varchar(255),
 entity         integer DEFAULT 1 NOT NULL,		-- Multi company id
 fk_user        integer NOT NULL,
 fk_user_create integer,