Fix vuejs#337

chrisvfritz · web-flow · commit 0b6537e9ac90 · 2016-07-14T13:18:49.000-04:00
diff --git a/src/guide/computed.md b/src/guide/computed.md
@@ -94,6 +94,7 @@ The above code is imperative and repetitive. Compare it with a computed property
 
 ``` js
 var vm = new Vue({
+  el: '#demo',
   data: {
     firstName: 'Foo',
     lastName: 'Bar'
