diff --git a/module2/exo1/toy_notebook_en.ipynb b/module2/exo1/toy_notebook_en.ipynb
index 0bbbe371b01e359e381e43239412d77bf53fb1fb..2abc97451e0edb397a295b3b05c618b97f8f791a 100644
--- a/module2/exo1/toy_notebook_en.ipynb
+++ b/module2/exo1/toy_notebook_en.ipynb
@@ -23,3 +23,4 @@
  "nbformat_minor": 2
 }
 
+# On the computation of $\pi$