diff --git a/src/store/memory.js b/src/store/memory.js
index d6c4bbbb0..e2d6a54ae 100644
--- a/src/store/memory.js
+++ b/src/store/memory.js
@@ -279,6 +279,8 @@ module.exports.MatrixInMemoryStore.prototype = {
 
     /**
      * setSyncData does nothing as there is no backing data store.
+     *
+     * @param {Object} syncData The sync data
      */
     setSyncData: function(syncData) {},
 
diff --git a/src/store/stub.js b/src/store/stub.js
index 2b64a2a2a..5234411a6 100644
--- a/src/store/stub.js
+++ b/src/store/stub.js
@@ -184,6 +184,8 @@ StubStore.prototype = {
 
     /**
      * setSyncData does nothing as there is no backing data store.
+     *
+     * @param {Object} syncData The sync data
      */
     setSyncData: function(syncData) {},