diff --git a/explainer/index.html b/explainer/index.html
index 0607d2da..a6422f2c 100755
--- a/explainer/index.html
+++ b/explainer/index.html
@@ -193,7 +193,7 @@ <h3 id="lifecycle-callbacks">Lifecycle Callbacks</h3>
 &lt;/template&gt;
 &lt;script&gt;
 var p = Object.create(HTMLElement.prototype);
-p.createdCallback: function() {
+p.createdCallback = function() {
     this._root = this.createShadowRoot();
     var template = document.querySelector('#tick-tock-clock-template');
     this._root.appendChild(document.importNode(template.content));