diff --git a/lib/elements/dom-bind.js b/lib/elements/dom-bind.js
index 512e01c973..4144c08d77 100644
--- a/lib/elements/dom-bind.js
+++ b/lib/elements/dom-bind.js
@@ -19,6 +19,7 @@ import { GestureEventListeners } from '../mixins/gesture-event-listeners.js';
  * @implements {Polymer_PropertyEffects}
  * @implements {Polymer_OptionalMutableData}
  * @implements {Polymer_GestureEventListeners}
+ * @private
  */
 const domBindBase =
   GestureEventListeners(
diff --git a/lib/elements/dom-repeat.js b/lib/elements/dom-repeat.js
index 8ca614c857..7c3cbc96ca 100644
--- a/lib/elements/dom-repeat.js
+++ b/lib/elements/dom-repeat.js
@@ -20,6 +20,7 @@ import { timeOut, microTask } from '../utils/async.js';
  * @constructor
  * @implements {Polymer_OptionalMutableData}
  * @extends {PolymerElement}
+ * @private
  */
 const domRepeatBase = OptionalMutableData(PolymerElement);