diff --git a/code/database/mongo/migrations/novel.php b/code/database/mongo/migrations/novel.php
index ca81e49..b35cde3 100644
--- a/code/database/mongo/migrations/novel.php
+++ b/code/database/mongo/migrations/novel.php
@@ -59,5 +59,10 @@ return [
             'key' => ['n_have_chapter' => 1, 'n_forge_novel' => 1],
             'options' => ['unique' => false]
         ],
+
+        [
+            'key' => ['n_forge_novel' => 1],
+            'options' => ['unique' => false]
+        ],
     ]
 ];