diff --git a/notebooks/wut-web-dev.ipynb b/notebooks/wut-web-dev.ipynb
index 57d20dd..8b1f280 100644
--- a/notebooks/wut-web-dev.ipynb
+++ b/notebooks/wut-web-dev.ipynb
@@ -27,6 +27,37 @@
     "import ipywidgets as widgets"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import time\n",
+    "from ipywidgets import Button\n",
+    "from jupyter_ui_poll import ui_events\n",
+    "\n",
+    "# Set up simple GUI, button with on_click callback\n",
+    "# that sets ui_done=True and changes button text\n",
+    "ui_done = False\n",
+    "def on_click(btn):\n",
+    "    global ui_done\n",
+    "    ui_done = True\n",
+    "    btn.description = '👍'\n",
+    "\n",
+    "btn = Button(description='Click Me')\n",
+    "btn.on_click(on_click)\n",
+    "display(btn)\n",
+    "\n",
+    "# Wait for user to press the button\n",
+    "with ui_events() as poll:\n",
+    "    while ui_done is False:\n",
+    "        poll(10)                # React to UI events (upto 10 at a time)\n",
+    "        print('.', end='')\n",
+    "        time.sleep(0.1)\n",
+    "print('done')"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -45,7 +76,7 @@
     ")\n",
     "\n",
     "display(slider)\n",
-    "time.sleep(90) # move slider to 5"
+    "time.sleep(1) # move slider to 5"
    ]
   },
   {