diff -r 1baa7c6bd370 -r 3079cbf80006 server/src/app/Http/Controllers/Api/DocumentController.php
--- a/server/src/app/Http/Controllers/Api/DocumentController.php	Thu Mar 03 17:34:12 2016 +0100
+++ b/server/src/app/Http/Controllers/Api/DocumentController.php	Fri Mar 04 10:08:52 2016 +0100
@@ -100,8 +100,11 @@
             abort(404);
         }
 
-        //for now, update contributors only
+        //for now, update contributors and subjects only
         $doc->setContributors($document['contributors']);
+        $doc->setSubjects($document['subjects']);
+
+        $doc->setModified();
 
         $this->documentRepository->save($doc);