diff --git a/demo/voila_demo.ipynb b/demo/voila_demo.ipynb
index e9164b0..cd0431f 100644
--- a/demo/voila_demo.ipynb
+++ b/demo/voila_demo.ipynb
@@ -73,6 +73,7 @@
     "import warnings\n",
     "import time\n",
     "import json\n",
+    "import re\n",
     "from IPython import display\n",
     "# atl03 plotting imports\n",
     "import numpy as np\n",
@@ -334,7 +335,10 @@
     "    with show_code06_output:\n",
     "        display.clear_output()\n",
     "        print(f'icesat2.init(\"{url_textbox.value}\")')\n",
-    "        print('parms = ', json.dumps(atl06_parms, indent=4), sep='')\n",
+    "        # validate boolean entries to be in title case\n",
+    "        atl06_json = json.dumps(atl06_parms, indent=4)\n",
+    "        atl06_json = re.sub(r'\\b(true|false)', lambda m: m.group(1).title(), atl06_json)\n",
+    "        print('parms = ', atl06_json, sep='')\n",
     "        print('gdf = icesat2.atl06p(parms, asset=\"icesat2\")')\n",
     "        \n",
     "# link buttons\n",
@@ -570,7 +574,10 @@
     "    with show_code03_output:\n",
     "        display.clear_output()\n",
     "        print(f'icesat2.init(\"{url_textbox.value}\")')\n",
-    "        print('parms = ', json.dumps(atl03_parms, indent=4), sep='')\n",
+    "        # validate boolean entries to be in title case\n",
+    "        atl03_json = json.dumps(atl03_parms, indent=4)\n",
+    "        atl03_json = re.sub(r'\\b(true|false)', lambda m: m.group(1).title(), atl03_json)\n",
+    "        print('parms = ', atl03_json, sep='')\n",
     "        print('gdf = icesat2.atl03sp(parms, asset=\"icesat2\")')\n",
     "        \n",
     "# install click handler callback\n",
@@ -651,7 +658,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.11.3"
+   "version": "3.10.6"
   },
   "toc-showtags": false
  },