diff --git a/ml1/2_3_0_Visualisation.ipynb b/ml1/2_3_0_Visualisation.ipynb
index b208255..cc74e37 100644
--- a/ml1/2_3_0_Visualisation.ipynb
+++ b/ml1/2_3_0_Visualisation.ipynb
@@ -170,6 +170,8 @@
     "# x and y are all the samples from column 0 (sepal_length) and 1 (sepal_width) respectively\n",
     "x,y = iris.data[:,0],  iris.data[:,1]\n",
     "\n",
+    "#if you want to understand better this code, see what happens when you replace name by 0, 1, 2 in the line\n",
+    "#  cond = iris.target == name. \n",
     "for name in names:\n",
     "    cond = iris.target == name\n",
     "    plt.plot(x[cond], y[cond], linestyle='none', marker='o', label=iris.target_names[name])\n",
@@ -262,7 +264,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.5.5"
+   "version": "3.7.1"
   },
   "latex_envs": {
    "LaTeX_envs_menu_present": true,