diff --git a/module2/exo1/toy_notebook_en.ipynb b/module2/exo1/toy_notebook_en.ipynb
index 36eac2b3aafec90d34a20992f9bfcc1567635d4a..232e72b4f0ebb4a621ca3007c9e65feb1bddbb64 100644
--- a/module2/exo1/toy_notebook_en.ipynb
+++ b/module2/exo1/toy_notebook_en.ipynb
@@ -14,6 +14,11 @@
     }
    ],
    "source": [
+    "# On the computation of $\\pi$\n",
+    "\n",
+    "## Asking the maths library\n",
+    "My computer tells me that $\\pi$ is *approximatively*\n",
+    "\n",
     "from math import *\n",
     "print(pi)\n"
    ]