diff --git a/schema.sql b/schema.sql
index 0bbcd59..7806aaa 100644
--- a/schema.sql
+++ b/schema.sql
@@ -66,9 +66,11 @@ CREATE TABLE IF NOT EXISTS cad (
 CREATE TABLE IF NOT EXISTS drawing (
 	id INTEGER AUTO_INCREMENT PRIMARY KEY, -- index
 	cad INTEGER NOT NULL,
+	part INTEGER NOT NULL,
 	path TEXT NOT NULL,
 	option TEXT,
-	FOREIGN KEY (cad) REFERENCES cad (id)
+	FOREIGN KEY (cad) REFERENCES cad (id),
+	FOREIGN KEY (part) REFERENCES part (id)
 );
 
 -- a part at a distributor