diff --git a/module3/exo3/exercice.ipynb b/module3/exo3/exercice.ipynb
index dbbefd3811aa4f62b48496e55efab9927adef5c4..45c637612d77b4ed4f828d000d5385687f4f23ae 100644
--- a/module3/exo3/exercice.ipynb
+++ b/module3/exo3/exercice.ipynb
@@ -1,5 +1,12 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "#  Subject 1: CO2 concentration in the atmosphere since 1958"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 1,
@@ -1012,6 +1019,13 @@
     "raw_data"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Subject 4: Latency and capacity estimation for a network connection from asymmetric measurements\n"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,