diff --git a/lib/index.js b/lib/index.js
index 3eb30e4..2ee4e58 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -1,9 +1,13 @@
 'use strict';
 
 var request;
-var defaults = {};
+var defaults = {
+	wait: 15 * 1000
+};
 
 module.exports.create = function(config) {
+	var wait = config.wait || defaults.wait;
+
 	return {
 		init: function(opts) {
 			request = opts.request;
@@ -14,14 +18,22 @@ module.exports.create = function(config) {
 			throw Error('listing zones not implemented');
 		},
 		set: function(data) {
+			// console.info('Add TXT', data);
 			var ch = data.challenge;
 			if (!ch.dnsZone) {
 				// zones() is not implemented for http-01 challenges,
-				// but it is almost always implemented for dns-01 challenges
+				// but it is almost always implemented for dns-01 challenges.
+				// Any plugin that implements zones() should expect ch.dnsZone here
 				throw new Error('No matching zone for ' + ch.dnsHost);
 			}
-			// console.info('Add TXT', data);
+
 			throw Error('setting TXT not implemented');
+			// many APIs return a valid response quite a bit
+			// before they actually set the record, and checking
+			// too quickly will self-poison the response cache.
+			return new Promise(function(resolve) {
+				setTimeout(resolve, wait, null);
+			});
 		},
 		remove: function(data) {
 			// console.info('Remove TXT', data);