diff --git a/examples/wall.ipynb b/examples/wall.ipynb
index 4814fe1d..43adc529 100644
--- a/examples/wall.ipynb
+++ b/examples/wall.ipynb
@@ -365,7 +365,7 @@
    "outputs": [],
    "source": [
     "def compute_flux(t, state, system):\n",
-    "    \"\"\"Compute the fluxes between the walls surfaces and the internal masses.\n",
+    "    \"\"\"Compute the fluxes between the wall's surfaces and the internal masses.\n",
     "    \n",
     "    state: State with T_C1 and T_C2\n",
     "    t: time in seconds\n",