diff --git a/code/model/DMSDocument.php b/code/model/DMSDocument.php
index 470cdb3..6954160 100644
--- a/code/model/DMSDocument.php
+++ b/code/model/DMSDocument.php
@@ -1004,7 +1004,8 @@ class DMSDocument extends DataObject implements DMSDocumentInterface
             $this->LastEditedByID = $currentUserID;
         }
 
-        // make sure default DownloadBehavior is respected when writing since
+        // make sure default DownloadBehavior is respected when initially writing document
+        // in case the default in the enum is different than what's set in an outside config
         $defaultDownloadBehaviour = Config::inst()->get('DMSDocument', 'default_download_behaviour');
         if ($this->DownloadBehavior == null && !empty($defaultDownloadBehaviour)) {
             $possibleBehaviors = $this->dbObject('DownloadBehavior')