diff --git a/src/05-altair.ipynb b/src/05-altair.ipynb
index 5e309b7..d43f9ab 100644
--- a/src/05-altair.ipynb
+++ b/src/05-altair.ipynb
@@ -552,6 +552,7 @@
     "* Sur l'axe vertical, spécifiez `'count()'` comme variable pour que\n",
     "  Altair fasse automatiquement le décompte, ce qui évite de passer\n",
     "  par la méthode `groupby()` du DataFrame\n",
+    "* Activez le canal `tooltip` avec `'count()'` pour avoir le décompte\n",
     "\n",
     "(4 min.)"
    ]
@@ -574,6 +575,7 @@
     "  [`'ordinal'` type](https://altair-viz.github.io/user_guide/encodings/#encoding-data-types)\n",
     "* For the Y axis, specify `'count()'` as a temporary field computed\n",
     "  automatically by Altair, which saves us from using `groupby()`\n",
+    "* Activate the `tooltip` channel with `'count()'`\n",
     "\n",
     "(4 min.)"
    ]
@@ -593,6 +595,7 @@
     "alt.Chart(surveys_complet).mark_bar().encode(\n",
     "    x=alt.X('plot_id').type('ordinal'),\n",
     "    y=alt.Y('count()'),\n",
+    "    tooltip=['count()'],\n",
     ")"
    ]
   },
@@ -611,6 +614,7 @@
     "###(surveys_complet)###\n",
     "    ###('plot_id').type('ordinal'),\n",
     "    ###('count()'),\n",
+    "    ###['count()'],\n",
     ")"
    ]
   },
@@ -629,6 +633,7 @@
     "alt.Chart(surveys_complete).mark_bar().encode(\n",
     "    x=alt.X('plot_id').type('ordinal'),\n",
     "    y=alt.Y('count()'),\n",
+    "    tooltip=['count()'],\n",
     ")"
    ]
   },
@@ -647,6 +652,7 @@
     "###(surveys_complete)###\n",
     "    ###('plot_id').type('ordinal'),\n",
     "    ###('count()'),\n",
+    "    ###['count()'],\n",
     ")"
    ]
   },
@@ -976,8 +982,7 @@
     "  `'sex'`. La méthode `.scale()` permet ensuite d'associer les valeurs\n",
     "  de domaine `'F'` et `'M'` aux couleurs `'orange'` et `'green'`.\n",
     "  Voir [un exemple ici](https://altair-viz.github.io/user_guide/customization.html#color-domain-and-range)\n",
-    "* Activez le canal `tooltip` avec `'count()'` pour avoir le décompte\n",
-    "  par sexe\n",
+    "* Dans le canal `tooltip`, ajoutez `'sex'` au début de la liste\n",
     "\n",
     "(4 min.)"
    ]
@@ -996,8 +1001,7 @@
     "  The `.scale()` method can then associate domain values `'F'`\n",
     "  and `'M'` to colors `'orange'` and `'green'`, respectively.\n",
     "  See [an example here](https://altair-viz.github.io/user_guide/customization.html#color-domain-and-range)\n",
-    "* Activate the `tooltip` channel with\n",
-    "  `'count()'` in order to get the count by sex\n",
+    "* In the `tooltip` channel, add `'sex'` at the beginning of the list\n",
     "\n",
     "(4 min.)"
    ]
@@ -1021,7 +1025,7 @@
     "        domain=['F', 'M'],\n",
     "        range=['orange', 'green'],\n",
     "    ),\n",
-    "    tooltip=['count()'],\n",
+    "    tooltip=['sex', 'count()'],\n",
     ")"
    ]
   },
@@ -1044,7 +1048,7 @@
     "        ###=['F', 'M'],\n",
     "        ###=['orange', 'green'],\n",
     "    ),\n",
-    "    ###['count()'],\n",
+    "    tooltip=[###, 'count()'],\n",
     ")"
    ]
   },
@@ -1067,7 +1071,7 @@
     "        domain=['F', 'M'],\n",
     "        range=['orange', 'green'],\n",
     "    ),\n",
-    "    tooltip=['count()'],\n",
+    "    tooltip=['sex', 'count()'],\n",
     ")"
    ]
   },
@@ -1090,7 +1094,7 @@
     "        ###=['F', 'M'],\n",
     "        ###=['orange', 'green'],\n",
     "    ),\n",
-    "    ###['count()'],\n",
+    "    tooltip=[###, 'count()'],\n",
     ")"
    ]
   },