diff --git a/migrations/000.331.sql b/migrations/000.331.sql
new file mode 100644
index 0000000..d75d07a
--- /dev/null
+++ b/migrations/000.331.sql
@@ -0,0 +1,3 @@
+-- P5-7135: add order id to samples
+
+alter table samples add column order_id integer references orders;