diff --git a/module2/exo1/toy_notebook_en.ipynb b/module2/exo1/toy_notebook_en.ipynb
index 7e755449b9c9eb0183adcdf9382d21d7b3b9efa8..3d4a08ff59abe493f175c7dee347269961a19378 100644
--- a/module2/exo1/toy_notebook_en.ipynb
+++ b/module2/exo1/toy_notebook_en.ipynb
@@ -7,6 +7,13 @@
     "## 1 À propos du calcul de π"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## 1.1 En demandant à la lib maths"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,