diff --git a/htdocs/install/mysql/migration/3.3.0-3.4.0.sql b/htdocs/install/mysql/migration/3.3.0-3.4.0.sql
index d36cd39c441..2055bc2b1ab 100755
--- a/htdocs/install/mysql/migration/3.3.0-3.4.0.sql
+++ b/htdocs/install/mysql/migration/3.3.0-3.4.0.sql
@@ -210,3 +210,4 @@ ALTER TABLE llx_user ADD COLUMN   fk_state          integer        DEFAULT 0;
 ALTER TABLE llx_user ADD COLUMN   fk_country        integer        DEFAULT 0;
 ALTER TABLE llx_product_price ADD COLUMN import_key varchar(14) AFTER price_by_qty;
 
+ALTER TABLE llx_socpeople ADD COLUMN ref_ext varchar(128) after entity;
diff --git a/htdocs/install/mysql/tables/llx_socpeople.sql b/htdocs/install/mysql/tables/llx_socpeople.sql
index 565e3b0cfee..4dbd835a7f8 100644
--- a/htdocs/install/mysql/tables/llx_socpeople.sql
+++ b/htdocs/install/mysql/tables/llx_socpeople.sql
@@ -25,6 +25,7 @@ create table llx_socpeople
   tms				timestamp,
   fk_soc			integer,									-- lien vers la societe
   entity			integer DEFAULT 1 NOT NULL,					-- multi company id
+  ref_ext           varchar(128),                               -- reference into an external system (not used by dolibarr)
   civilite			varchar(6),
   lastname			varchar(50),
   firstname			varchar(50),