diff --git a/module2/exo1/toy_notebook_en.ipynb b/module2/exo1/toy_notebook_en.ipynb
index 9ac3e2d98c4ac78cba8f595c32bc4a20976566b8..16b0aed18bdb3b09ab0224443c187b058463bc7c 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",