diff --git a/module2/exo1/toy_notebook_en.ipynb b/module2/exo1/toy_notebook_en.ipynb
index f1170f5fee1ed35a866fcee6e264157febd009ca..c0fbcd646c0881cd3d721b22e8e4fb3d387f2c3f 100644
--- a/module2/exo1/toy_notebook_en.ipynb
+++ b/module2/exo1/toy_notebook_en.ipynb
@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# On the computation of π"
+    "# On the computation of $\\pi$"
    ]
   },
   {