diff --git a/backend/migrations/177_add_subscription_plan_currency.sql b/backend/migrations/177_add_subscription_plan_currency.sql
new file mode 100644
index 0000000000..9ed13ddc10
--- /dev/null
+++ b/backend/migrations/177_add_subscription_plan_currency.sql
@@ -0,0 +1,4 @@
+-- Display-only ISO 4217 currency label for subscription plan prices; empty
+-- keeps existing plans rendering without any label.
+ALTER TABLE subscription_plans
+    ADD COLUMN IF NOT EXISTS currency VARCHAR(3) NOT NULL DEFAULT '';