diff --git a/module3/exo1/analyse-syndrome-grippal.ipynb b/module3/exo1/analyse-syndrome-grippal.ipynb
index fbbc4ece27ffcf7134943667ada6f6117d5040f1..e54396eb6893734dfbde84968870708f524c2535 100644
--- a/module3/exo1/analyse-syndrome-grippal.ipynb
+++ b/module3/exo1/analyse-syndrome-grippal.ipynb
@@ -89,7 +89,7 @@
     "    print(\"File '{}' exists\".format(filename))\n",
     "else:\n",
     "    print(\"File '{}' does not exist, downloading...\".format(filename))\n",
-    "    urllib.request.urlretrieve(data_url, 'influenza_data.csv')\n",
+    "    urllib.request.urlretrieve(data_url, filename)\n",
     "    download_time = date.today()\n",
     "    print(\"File '{}' downloaded on {}.\".format(filename, download_time))\n"
    ]
diff --git a/module3/exo2/exercice.ipynb b/module3/exo2/exercice.ipynb
index 0bbbe371b01e359e381e43239412d77bf53fb1fb..c7ef713f7b967c3f8aff77320daf9bb48e995fe9 100644
--- a/module3/exo2/exercice.ipynb
+++ b/module3/exo2/exercice.ipynb
@@ -1,5 +1,64 @@
 {
- "cells": [],
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Incidence de la varicelle"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "%matplotlib inline\n",
+    "import matplotlib.pyplot as plt\n",
+    "import pandas as pd\n",
+    "import isoweek"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Les données de l'incidence du syndrome de varicelle sont disponibles du site Web du [Réseau Sentinelles](http://www.sentiweb.fr/). Nous les récupérons sous forme d'un fichier en format CSV dont chaque ligne correspond à une semaine de la période demandée. Nous téléchargeons toujours le jeu de données complet, qui commence en 1984 et se termine avec une semaine récente."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "data_url = 'https://www.sentiweb.fr/datasets/incidence-PAY-7.csv'"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "Voici l'explication des colonnes données [sur le site d'origine](https://ns.sentiweb.fr/incidence/csv-schema-v1.json):\n",
+    "\n",
+    "Schema\n",
+    "Name \tType \tLabel \tDescription\n",
+    "week PK \tinteger \t\tISO8601 Yearweek number as numeric (year*100 + week nubmer)\n",
+    "geo_insee PK \tstring \t\tIdentifier of the geographic area, from INSEE https://www.insee.fr\n",
+    "geo_name \tstring \t\tGeographic label of the area, corresponding to INSEE code. This label is not an id and is only provided for human reading\n",
+    "indicator PK \tinteger \t\tUnique identifier of the indicator, see metadata document https://www.sentiweb.fr/meta.json\n",
+    "inc \tinteger \t\tEstimated incidence value for the time step, in the geographic level\n",
+    "inc_low \tinteger \t\tLower bound of the estimated incidence 95% Confidence Interval\n",
+    "inc_up \tinteger \t\tUpper bound of the estimated incidence 95% Confidence Interval\n",
+    "inc100 \tinteger \t\tEstimated rate incidence per 100,000 inhabitants\n",
+    "inc100_low \tinteger \t\tLower bound of the estimated incidence 95% Confidence Interval\n",
+    "inc100_up \tinteger \t\tUpper bound of the estimated rate incidence 95% Confidence Interval\n",
+    "Missing value : -"
+   ]
+  }
+ ],
  "metadata": {
   "kernelspec": {
    "display_name": "Python 3",
@@ -16,10 +75,9 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.3"
+   "version": "3.6.4"
   }
  },
  "nbformat": 4,
  "nbformat_minor": 2
 }
-