diff --git a/module2/exo1/toy_notebook_en.ipynb b/module2/exo1/toy_notebook_en.ipynb
index e0ba4038e80cccbea0c9838b50d939dff7a5714d..65c2d4e5d28e14bcbb22e1c6bb58634c31719981 100644
--- a/module2/exo1/toy_notebook_en.ipynb
+++ b/module2/exo1/toy_notebook_en.ipynb
@@ -1,3 +1,6 @@
+# On the computation of $\pi$
+## Asking the maths library
+My computer tells me that $\pi$ is *approximatively*
 {
  "cells": [
   {