diff --git a/java/google/registry/ui/externs/braintree.js b/java/google/registry/ui/externs/braintree.js
index ac71586e9..756d7fba5 100644
--- a/java/google/registry/ui/externs/braintree.js
+++ b/java/google/registry/ui/externs/braintree.js
@@ -196,9 +196,15 @@ braintreepayments.Integrator.prototype.teardown = function(opt_callback) {};
 braintreepayments.PaypalIntegrator = function() {};
 
 
+/**
+ * @return {void}
+ */
 braintreepayments.PaypalIntegrator.prototype.closeAuthFlow = function() {};
 
 
+/**
+ * @return {void}
+ */
 braintreepayments.PaypalIntegrator.prototype.initAuthFlow = function() {};