diff --git a/documentation/coffee/async.coffee b/documentation/examples/async.coffee
similarity index 65%
rename from documentation/coffee/async.coffee
rename to documentation/examples/async.coffee
index 23dd85f0..1b95b6ee 100644
--- a/documentation/coffee/async.coffee
+++ b/documentation/examples/async.coffee
@@ -1,15 +1,18 @@
+# Your browser must support async/await and speech synthesis
+# to run this example.
+
 sleep = (ms) ->
   new Promise (resolve) ->
     window.setTimeout resolve, ms
 
 say = (text) ->
-  window.speechSynthesis.cancel() # cancel any prior utterances
+  window.speechSynthesis.cancel()
   window.speechSynthesis.speak new SpeechSynthesisUtterance text
 
 countdown = (seconds) ->
   for i in [seconds..1]
-    say "#{i}"
+    say i
     await sleep 1000 # wait one second
   say "Blastoff!"
 
-countdown(3)
+countdown 3
diff --git a/documentation/js/async.js b/documentation/js/async.js
deleted file mode 100644
index 5c13b246..00000000
--- a/documentation/js/async.js
+++ /dev/null
@@ -1,23 +0,0 @@
-// Generated by CoffeeScript 2.0.0-alpha
-var countdown, sleep;
-
-sleep = function(ms) {
-  return new Promise(function(resolve) {
-    return window.setTimeout(resolve, ms);
-  });
-};
-
-countdown = async function(seconds) {
-  var i, j, ref, utterance;
-  for (i = j = ref = seconds; ref <= 1 ? j <= 1 : j >= 1; i = ref <= 1 ? ++j : --j) {
-    if (window.speechSynthesis != null) {
-      utterance = new SpeechSynthesisUtterance("" + i);
-      window.speechSynthesis.speak(utterance);
-    }
-    console.log(i);
-    await sleep(1000);
-  }
-  return alert("Done! (Check the console!)");
-};
-
-countdown(3);