diff --git a/migrations/000.261.sql b/migrations/000.261.sql
new file mode 100644
index 0000000..09c6a2a
--- /dev/null
+++ b/migrations/000.261.sql
@@ -0,0 +1,20 @@
+-- P5-6245: add market id to product blacklist table
+
+alter table product_blacklist
+    add column market_id integer;
+
+alter table product_blacklist
+    add constraint market_fkey
+    foreign key (market_id)
+    references markets(id) match simple;
+
+update product_blacklist SET market_id = (
+    select markets.id from markets
+    join locales on markets.locale_id = locales.id
+    where locales.value = product_blacklist.language_id || '_' || product_blacklist.territory_id
+);
+
+alter table product_blacklist
+    alter column market_id set not null;
+
+create unique index on product_blacklist (product_id, group_id, market_id);