diff --git a/12/index.html b/12/index.html
index 274b68a..24f691a 100644
--- a/12/index.html
+++ b/12/index.html
@@ -73,6 +73,7 @@
         <div id="info"><div id="title"></div><div id="authors"></div></div>
         <script src="pipeserver.js"></script>
       <div id="torusKnot">
+        <script src="https://threejs.org/build/three.js"></script>
         <script src="torusKnot.js"></script>
       </div>