diff --git a/src/store/indexeddb-local-backend.js b/src/store/indexeddb-local-backend.js
index 8d2cfcafe..7f87c5739 100644
--- a/src/store/indexeddb-local-backend.js
+++ b/src/store/indexeddb-local-backend.js
@@ -140,6 +140,7 @@ LocalIndexedDBStoreBackend.prototype = {
 
     /**
      * Having connected, load initial data from the database and prepare for use
+     * @return {Promise} Resolves on success
      */
     _init: function() {
         return q.all([