diff --git a/examples/particle-simulation/index.html b/examples/particle-simulation/index.html
index e94d622..5e0c656 100644
--- a/examples/particle-simulation/index.html
+++ b/examples/particle-simulation/index.html
@@ -18,6 +18,7 @@
     {
       "imports": {
         "three": "/examples/js/vendor/three/build/three.module.js",
+        "lil-gui": "/examples/js/vendor/lil-gui/dist/lil-gui.esm.js",
         "@forge-gfx/forge": "/dist/forge.module.js"
       }
     }
diff --git a/scripts/copy-site-files.js b/scripts/copy-site-files.js
index 4d78829..6003e97 100644
--- a/scripts/copy-site-files.js
+++ b/scripts/copy-site-files.js
@@ -25,5 +25,6 @@ await copyFile("examples.html", "docs/examples/index.html");
 await rename("docs/examples/viewer", "docs/viewer");
 await mkdir("docs/examples/vendor", { recursive: true });
 copyDir("node_modules/three", "docs/examples/js/vendor/three");
+copyDir("node_modules/lil-gui", "docs/examples/js/vendor/lil-gui");
 copyDir("dist", "docs/dist");
 console.log("Site generated in docs directory.");