diff --git a/src/primaite/notebooks/create-simulation.ipynb b/src/primaite/notebooks/create-simulation.ipynb
index 86a7f6a2..a3e2d92c 100644
--- a/src/primaite/notebooks/create-simulation.ipynb
+++ b/src/primaite/notebooks/create-simulation.ipynb
@@ -464,6 +464,13 @@
     "my_sim.describe_state()"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Verify that the state dictionary contains no non-serialisable objects."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 17,