diff --git a/module2/exo1/toy_notebook_en.ipynb b/module2/exo1/toy_notebook_en.ipynb
index 0bbbe371b01e359e381e43239412d77bf53fb1fb..fef65ade67e639f4022992f6459bd65abc8eac81 100644
--- a/module2/exo1/toy_notebook_en.ipynb
+++ b/module2/exo1/toy_notebook_en.ipynb
@@ -1,6 +1,7 @@
 {
  "cells": [],
  "metadata": {
+ "celltoolbar": "Hide code",
   "kernelspec": {
    "display_name": "Python 3",
    "language": "python",