diff --git a/module2/exo1/toy_notebook_en.ipynb b/module2/exo1/toy_notebook_en.ipynb
index 46fe37cf681eaa310592deaf153558045f3f5480..07db2b70b3a61ceb87667685fbbe3ba8df318d24 100644
--- a/module2/exo1/toy_notebook_en.ipynb
+++ b/module2/exo1/toy_notebook_en.ipynb
@@ -4,14 +4,14 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# 1. On the computation of $\\pi$"
+    "# On the computation of $\\pi$"
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## 1.1. Asking the maths library"
+    "## Asking the maths library"
    ]
   },
   {
@@ -43,7 +43,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## 1.2. Buffon's needle"
+    "## Buffon's needle"
    ]
   },
   {
@@ -82,7 +82,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## 1.3. Using a surface fraction argument"
+    "## Using a surface fraction argument"
    ]
   },
   {