diff --git a/tables.sql b/tables.sql
index 3ba7a10..2e5dd05 100644
--- a/tables.sql
+++ b/tables.sql
@@ -4,7 +4,9 @@ create table settings( id integer, import_path varchar, last_import_date float,
 
 create table FILE_TYPE ( ID integer, NAME varchar(32) unique, constraint PK_FILE_TYPE_ID primary key(ID) );
 
-create table ENTRY( ID integer, NAME varchar(128), TYPE integer, constraint PK_ENTRY_ID primary key(ID) );
+create table ENTRY( ID integer, NAME varchar(128), TYPE_ID integer,
+    constraint PK_ENTRY_ID primary key(ID),
+    constraint FK_FILE_TYPE_TYPE_ID foreign key (TYPE_ID) references FILE_TYPE(ID) );
 
 create table NEW_FILE ( EID integer, SIZE_MB integer, HASH varchar(34), THUMBNAIL varchar, 
     constraint PK_FILE_ID primary key(EID),