diff --git a/module3/exo3/exercice.ipynb b/module3/exo3/exercice.ipynb
index 6d0aa2601495b739d7766380ea5507e6b627afff..ce3753721cb869f31e3011a2ae9be60eafcac634 100644
--- a/module3/exo3/exercice.ipynb
+++ b/module3/exo3/exercice.ipynb
@@ -169,24 +169,24 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 9,
+   "execution_count": 51,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "        Date  Concentration  Year  Mean_CO2_Concentration\n",
-      "0 1958-03-29         316.19  1958                 315.474\n",
-      "1 1958-04-05         317.31  1958                 315.474\n",
-      "2 1958-04-12         317.69  1958                 315.474\n",
-      "3 1958-04-19         317.58  1958                 315.474\n",
-      "4 1958-04-26         316.48  1958                 315.474\n"
+      "        Date  Concentration  Year  Mean_CO2_Concentration  Oscilation\n",
+      "0 1958-03-29         316.19  1958                 315.474       0.716\n",
+      "1 1958-04-05         317.31  1958                 315.474       1.836\n",
+      "2 1958-04-12         317.69  1958                 315.474       2.216\n",
+      "3 1958-04-19         317.58  1958                 315.474       2.106\n",
+      "4 1958-04-26         316.48  1958                 315.474       1.006\n"
      ]
     }
    ],
    "source": [
-    "# Calculez la valeur moyenne par an et créez une nouvelle colonne 'Concentration moyenne de CO2'\n",
+    "# Contribution lente. Calculez la valeur moyenne par an et créez une nouvelle colonne 'Concentration moyenne de CO2'\n",
     "data['Mean_CO2_Concentration'] = data.groupby('Year')['Concentration'].transform('mean')\n",
     "print(data.head())"
    ]