diff --git a/module3/exo3/exercice.ipynb b/module3/exo3/exercice.ipynb
index c543b9f9e37fc136db5a1b6fede860d758c892f2..e707d90482847120c053becde690cbab1cd49b46 100644
--- a/module3/exo3/exercice.ipynb
+++ b/module3/exo3/exercice.ipynb
@@ -17,11 +17,21 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 7,
    "metadata": {},
    "outputs": [],
    "source": [
-    "data := https://scrippsco2.ucsd.edu/data/atmospheric_co2/primary_mlo_co2_record.html"
+    "data = \"https://scrippsco2.ucsd.edu/data/atmospheric_co2/primary_mlo_co2_record.html\""
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#Fichier utilisé : \n",
+    "data_file = \"monthly_in_situ_co2_mlo.csv\""
    ]
   }
  ],