diff --git a/examples/How_to_format_inputs_to_ChatGPT_models.ipynb b/examples/How_to_format_inputs_to_ChatGPT_models.ipynb
index 246b12d..fafdc6d 100644
--- a/examples/How_to_format_inputs_to_ChatGPT_models.ipynb
+++ b/examples/How_to_format_inputs_to_ChatGPT_models.ipynb
@@ -49,7 +49,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# 2. An example chat API call\n",
+    "## 2. An example chat API call\n",
     "\n",
     "A chat API call has two required inputs:\n",
     "- `model`: the name of the model you want to use (e.g., `gpt-3.5-turbo`, `gpt-4`, `gpt-3.5-turbo-0613`, `gpt-3.5-turbo-16k-0613`)\n",