diff --git a/migrations/000.290.sql b/migrations/000.290.sql
new file mode 100644
index 0000000..5dc629c
--- /dev/null
+++ b/migrations/000.290.sql
@@ -0,0 +1,11 @@
+-- P5-6131 Splashes belong to market_locale
+
+ALTER TABLE slideshow_slides ADD COLUMN market_locale_id INTEGER REFERENCES market_locales (id);
+
+UPDATE slideshow_slides SET market_locale_id = (
+    select id from market_locales
+    where slideshow_slides.market_id = market_locales.market_id
+    order by market_locales.id limit 1
+);
+
+ALTER TABLE slideshow_slides ALTER COLUMN market_locale_id SET NOT NULL;