diff --git a/docs/dask_jupyterlab_extension_demo.ipynb b/docs/dask_jupyterlab_extension_demo.ipynb
index 1befe51..7b770d0 100644
--- a/docs/dask_jupyterlab_extension_demo.ipynb
+++ b/docs/dask_jupyterlab_extension_demo.ipynb
@@ -1,13 +1,27 @@
 {
  "cells": [
   {
-   "cell_type": "code",
-   "execution_count": null,
+   "cell_type": "markdown",
    "metadata": {},
-   "outputs": [],
    "source": [
     "##  basic Dask_jupyerlab extension demo\n",
-    "see  https://www.youtube.com/watch?feature=player_embedded&v=EX_voquHdk0"
+    "see  https://www.youtube.com/watch?feature=player_embedded&v=EX_voquHdk0\n",
+    "\n",
+    "If not working, see the how-to: https://github.com/dask/dask-labextension\n",
+    "\n",
+    "You may have, if not working, to re-run;\n",
+    "\n",
+    "<pre>jupyter serverextension enable dask_labextension</pre>\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Step 1: launch a Client\n",
+    "\n",
+    "- warning; Dask-Jupyterlab doesn't work for Python-3.9.1, even with Distributed-2020.12.0\n",
+    "- check here for progress on the issue: https://github.com/dask/distributed/issues/4168)"
    ]
   },
   {
@@ -23,7 +37,7 @@
        "<td style=\"vertical-align: top; border: 0px solid white\">\n",
        "<h3 style=\"text-align: left;\">Client</h3>\n",
        "<ul style=\"text-align: left; list-style: none; margin: 0; padding: 0;\">\n",
-       "  <li><b>Scheduler: </b>tcp://127.0.0.1:61256</li>\n",
+       "  <li><b>Scheduler: </b>tcp://127.0.0.1:52679</li>\n",
        "  <li><b>Dashboard: </b><a href='http://127.0.0.1:8787/status' target='_blank'>http://127.0.0.1:8787/status</a></li>\n",
        "</ul>\n",
        "</td>\n",
@@ -39,7 +53,7 @@
        "</table>"
       ],
       "text/plain": [
-       "<Client: 'tcp://127.0.0.1:61256' processes=4 threads=4, memory=8.44 GB>"
+       "<Client: 'tcp://127.0.0.1:52679' processes=4 threads=4, memory=8.44 GB>"
       ]
      },
      "execution_count": 1,
@@ -53,9 +67,22 @@
     "client"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## step2 \n",
+    "- click on the DASK Extension (the red pictures) on the left left pannel\n",
+    "- copy the Dashoard url (in blue in the cell above this one) in the DASK DASHBOARD URL ot the Dask Extension panel that appears\n",
+    "- click on the refresh circualr arrow on the left of the bottom CLUSTERS line of the Dask Extension panel\n",
+    "- .... this make the buttons of the DASK extension to go from GREY to ORANGE\n",
+    "- .....clicking on each of them open a dedicated pan with related information: for example \"GRAPH\"\n",
+    "- ..... with jupyterlan you can show it side-to-side with current notebook by moving tabs\n"
+   ]
+  },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 2,
    "metadata": {},
    "outputs": [
     {
@@ -118,7 +145,7 @@
        "  <line x1=\"120\" y1=\"0\" x2=\"120\" y2=\"120\" style=\"stroke-width:2\" />\n",
        "\n",
        "  <!-- Colored Rectangle -->\n",
-       "  <polygon points=\"0.000000,0.000000 120.000000,0.000000 120.000000,120.000000 0.000000,120.000000\" style=\"fill:#ECB172A0;stroke-width:0\"/>\n",
+       "  <polygon points=\"0.0,0.0 120.0,0.0 120.0,120.0 0.0,120.0\" style=\"fill:#ECB172A0;stroke-width:0\"/>\n",
        "\n",
        "  <!-- Text -->\n",
        "  <text x=\"60.000000\" y=\"140.000000\" font-size=\"1.0rem\" font-weight=\"100\" text-anchor=\"middle\" >20000</text>\n",
@@ -132,7 +159,7 @@
        "dask.array<random_sample, shape=(20000, 20000), dtype=float64, chunksize=(1250, 1250), chunktype=numpy.ndarray>"
       ]
      },
-     "execution_count": 4,
+     "execution_count": 2,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -146,16 +173,16 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": 4,
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "199998586.85963023"
+       "199999688.8147819"
       ]
      },
-     "execution_count": 6,
+     "execution_count": 4,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -189,7 +216,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.5"
+   "version": "3.8.7rc1"
   }
  },
  "nbformat": 4,