diff --git a/notebook/agentchat_nestedchat_optiguide.ipynb b/notebook/agentchat_nestedchat_optiguide.ipynb
index 78531c0e0b..52210cbe52 100644
--- a/notebook/agentchat_nestedchat_optiguide.ipynb
+++ b/notebook/agentchat_nestedchat_optiguide.ipynb
@@ -46,7 +46,7 @@
     "from termcolor import colored\n",
     "from autogen.code_utils import extract_code\n",
     "\n",
-    "# import auxillary packages\n",
+    "# import auxiliary packages\n",
     "import requests  # for loading the example source code\n",
     "\n",
     "config_list_gpt4 = autogen.config_list_from_json(\n",