diff --git a/app/Ninja/Transformers/InvoiceTransformer.php b/app/Ninja/Transformers/InvoiceTransformer.php
index c866f1213540..fc17127719a2 100644
--- a/app/Ninja/Transformers/InvoiceTransformer.php
+++ b/app/Ninja/Transformers/InvoiceTransformer.php
@@ -28,7 +28,7 @@ class InvoiceTransformer extends EntityTransformer
         'invitations',
         'payments',
         'client',
-        //'expenses',
+        'documents',
     ];
 
     public function __construct($account = null, $serializer = null, $client = null)
@@ -68,6 +68,12 @@ class InvoiceTransformer extends EntityTransformer
         return $this->includeCollection($invoice->expenses, $transformer, ENTITY_EXPENSE);
     }
 
+    public function includeDocuments(Invoice $invoice)
+    {
+        $transformer = new DocumentTransformer($this->account, $this->serializer);
+        return $this->includeCollection($invoice->documents, $transformer, ENTITY_DOCUMENT);
+    }
+
 
     public function transform(Invoice $invoice)
     {