diff --git a/lib/elements/array-selector.js b/lib/elements/array-selector.js
index f783dcefe9..c95b878a5c 100644
--- a/lib/elements/array-selector.js
+++ b/lib/elements/array-selector.js
@@ -344,6 +344,7 @@ export { ArraySelectorMixin };
  * @constructor
  * @extends {PolymerElement}
  * @implements {Polymer_ArraySelectorMixin}
+ * @private
  */
 let baseArraySelector = ArraySelectorMixin(PolymerElement);
 
diff --git a/lib/utils/templatize.js b/lib/utils/templatize.js
index 3fde57db87..eeaa755dd1 100644
--- a/lib/utils/templatize.js
+++ b/lib/utils/templatize.js
@@ -59,6 +59,7 @@ function upgradeTemplate(template, constructor) {
  * Base class for TemplateInstance.
  * @constructor
  * @implements {Polymer_PropertyEffects}
+ * @private
  */
 const base = PropertyEffects(class {});