diff --git a/module2/exo1/toy_notebook_fr.ipynb b/module2/exo1/toy_notebook_fr.ipynb
index 42f03f2cc0dc7455872471e9ba1889ccf89f96bf..8f108d035e016fa43edaa9ce7727e9f3e6723dad 100644
--- a/module2/exo1/toy_notebook_fr.ipynb
+++ b/module2/exo1/toy_notebook_fr.ipynb
@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# A propos du calcul de PI"
+    "# 1. A propos du calcul de PI"
    ]
   },
   {