diff --git a/module2/exo1/toy_notebook_en.ipynb b/module2/exo1/toy_notebook_en.ipynb
index ed3164037eda7890a98698a601981f4ce3a87cc1..a22c3bb921c1a5cc34eed58d3cd10bc408a8132b 100644
--- a/module2/exo1/toy_notebook_en.ipynb
+++ b/module2/exo1/toy_notebook_en.ipynb
@@ -4,14 +4,14 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# A propos de $\\pi$"
+    "# 1 A propos de $\\pi$"
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## En demandant à la lib maths"
+    "## 1.1 En demandant à la lib maths"
    ]
   },
   {