diff --git a/example-1.html b/example-1.html
index 31ef42c..e533d10 100644
--- a/example-1.html
+++ b/example-1.html
@@ -11,6 +11,7 @@
 </head>
 <body>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js"></script>
+<script src="https://cdn.jsdelivr.net/npm/three@0.128.0/examples/js/controls/OrbitControls.js"></script>
 <script src="example-1.js"></script>
 </body>
 </html>
