diff --git a/db/migrations/5.1.21_missing_indices_v50.php b/db/migrations/5.1.21_missing_indices_v50.php
index 3ef1fd75d4ff932b36b73b9172cb1eda44b7cb3a..39056fa4402435da964466614844ac595bb85318 100644
--- a/db/migrations/5.1.21_missing_indices_v50.php
+++ b/db/migrations/5.1.21_missing_indices_v50.php
@@ -1,6 +1,11 @@
 <?php
 final class MissingIndicesV50 extends Migration
 {
+    public function description()
+    {
+        return 'Add missing indices on some tables';
+    }
+
     public function up()
     {
         $query = "CREATE INDEX `range_id` ON `mvv_files_ranges` (`range_id`)";