diff --git a/Sql Server/OMOP CDM ddl - SQL Server.sql b/Sql Server/OMOP CDM ddl - SQL Server.sql
index 04a4269..a87c36e 100644
--- a/Sql Server/OMOP CDM ddl - SQL Server.sql	
+++ b/Sql Server/OMOP CDM ddl - SQL Server.sql	
@@ -65,7 +65,8 @@ CREATE TABLE vocabulary (
   vocabulary_name		VARCHAR(255)	NOT NULL,
   vocabulary_reference	VARCHAR(255)	NULL,
   vocabulary_version	VARCHAR(255)	NULL,
-  vocabulary_concept_id	INTEGER			NOT NULL
+  vocabulary_concept_id	INTEGER			NOT NULL,
+  latest_update			DATE			NULL
 )
 ;