diff --git a/src/Documents/DocumentManager.php b/src/Documents/DocumentManager.php
index 3929f15..e98ebd5 100644
--- a/src/Documents/DocumentManager.php
+++ b/src/Documents/DocumentManager.php
@@ -14,7 +14,7 @@ class DocumentManager
     use Client;
 
     /**
-     * @param Collection|Document[] $documents
+     * @param Collection<Document> $documents
      */
     public function index(
         string $indexName,