diff --git a/externs/polymer-externs.js b/externs/polymer-externs.js
index da5a2317fc..9ed377e848 100644
--- a/externs/polymer-externs.js
+++ b/externs/polymer-externs.js
@@ -150,6 +150,12 @@ Polymer.legacyNotifyOrder;
 /** @type {boolean} */
 Polymer.orderedComputed;
 
+/** @type {boolean} */
+Polymer.fastDomIf;
+
+/** @type {boolean} */
+Polymer.suppressTemplateNotifications;
+
 // nb. This is explicitly 'var', as Closure Compiler checks that this is the case.
 /**
  * @constructor