diff --git a/src/dev.js b/src/dev.js
index 078a3b5..4bc9138 100644
--- a/src/dev.js
+++ b/src/dev.js
@@ -13,6 +13,7 @@
 //   <script src="js/src/tween/easing.js"></script>
 //   <script src="js/src/tween/tween.js"></script>
 //   <script src="js/src/physics/atoms.js"></script>
+//   <script src="js/src/physics/barnes-hut.js"></script>
 //   <script src="js/src/physics/physics.js"></script>
 //   <script src="js/src/physics/system.js"></script>
 //   <script src="js/src/dev.js"></script>