diff --git a/website/db/migrations/20240110193718_legacy_geo_krety_mission.php b/website/db/migrations/20240110193718_legacy_geo_krety_mission.php
new file mode 100644
index 0000000000..748778c10e
--- /dev/null
+++ b/website/db/migrations/20240110193718_legacy_geo_krety_mission.php
@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+use Phinx\Migration\AbstractMigration;
+
+final class LegacyGeoKretyMission extends AbstractMigration {
+    public function change(): void {
+        $this->table('geokrety.gk_geokrety')
+            ->addColumn('legacy_mission', 'text', ['null' => true])
+            ->save();
+    }
+}