diff --git a/dsolovianov/postgresql/DDL.sql b/dsolovianov/postgresql/DDL.sql
index 5d2cdd7..033894c 100644
--- a/dsolovianov/postgresql/DDL.sql
+++ b/dsolovianov/postgresql/DDL.sql
@@ -32,5 +32,7 @@ CREATE TABLE dsolovianov.order_items (
     CONSTRAINT order_items_order_fk
     	FOREIGN KEY (order_id) REFERENCES dsolovianov.orders(id),
     CONSTRAINT order_items_product_fk
-    	FOREIGN KEY (product_id) REFERENCES dsolovianov.products(id)
+    	FOREIGN KEY (product_id) REFERENCES dsolovianov.products(id),
+    CONSTRAINT orders_user_fk
+    	FOREIGN KEY (user_id) REFERENCES dsolovianov.users(id)
 );
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