diff --git a/notebooks/module_0/rag_application.ipynb b/notebooks/module_0/rag_application.ipynb
index 750c288..6097214 100644
--- a/notebooks/module_0/rag_application.ipynb
+++ b/notebooks/module_0/rag_application.ipynb
@@ -48,6 +48,7 @@
     "os.environ[\"LANGSMITH_API_KEY\"] = \"\"\n",
     "os.environ[\"LANGSMITH_TRACING\"] = \"true\"\n",
     "os.environ[\"LANGSMITH_PROJECT\"] = \"langsmith-academy\""
+    "os.environ[\"USER_AGENT\"] = \"your_preferred_username\""
    ]
   },
   {