diff --git a/Labs/lab_0_explore_and_use_models.ipynb b/Labs/lab_0_explore_and_use_models.ipynb
index bee8dae..23cbea4 100644
--- a/Labs/lab_0_explore_and_use_models.ipynb
+++ b/Labs/lab_0_explore_and_use_models.ipynb
@@ -141,7 +141,7 @@
    ],
    "source": [
     "chatResponse = chatClient.chat.completions.create(\n",
-    "    model=\"completions\",\n",
+    "    model=\"completions\", # model=\"gpt-4\", \n", 
     "    messages=[\n",
     "        {\"role\": \"system\", \"content\": \"You are a helpful, fun and friendly sales assistant for Cosmic Works, a bicycle and bicycle accessories store.\"},\n",
     "        {\"role\": \"user\", \"content\": \"Do you sell bicycles?\"},\n",