diff --git a/lib/elements/array-selector.html b/lib/elements/array-selector.html
index 4f276c54e4..57b96c42d8 100644
--- a/lib/elements/array-selector.html
+++ b/lib/elements/array-selector.html
@@ -348,6 +348,7 @@
    * @constructor
    * @extends {Polymer.Element}
    * @implements {Polymer_ArraySelectorMixin}
+   * @private
    */
   let baseArraySelector = ArraySelectorMixin(Polymer.Element);
 
diff --git a/lib/utils/templatize.html b/lib/utils/templatize.html
index 85c59a1706..460a25530f 100644
--- a/lib/utils/templatize.html
+++ b/lib/utils/templatize.html
@@ -63,6 +63,7 @@
      * Base class for TemplateInstance.
      * @constructor
      * @implements {Polymer_PropertyEffects}
+     * @private
      */
     const base = Polymer.PropertyEffects(class {});