diff --git a/notebook/agentchat_RetrieveChat_mongodb.ipynb b/notebook/agentchat_RetrieveChat_mongodb.ipynb
index 18494e28401..0f24cf16579 100644
--- a/notebook/agentchat_RetrieveChat_mongodb.ipynb
+++ b/notebook/agentchat_RetrieveChat_mongodb.ipynb
@@ -29,7 +29,7 @@
     ":::\n",
     "````\n",
     "\n",
-    "Ensure you have a MongoDB Atlas instance with Cluster Tier >= M30."
+    "Ensure you have a MongoDB Atlas instance with Cluster Tier >= M10. Read more on Cluster support [here](https://www.mongodb.com/docs/atlas/atlas-search/manage-indexes/#create-and-manage-fts-indexes)"
    ]
   },
   {