diff --git a/README.md b/README.md
index 12f2448..ff32abc 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,9 @@
 [![CI](https://github.com/deepnote/jupyterlab-deepnote/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/deepnote/jupyterlab-deepnote/actions/workflows/ci.yml)
 [![codecov](https://codecov.io/gh/deepnote/jupyterlab-deepnote/graph/badge.svg?token=OV32VZNOJ2)](https://codecov.io/gh/deepnote/jupyterlab-deepnote)
 
-Read‑only viewer for Deepnote `.deepnote` files inside JupyterLab.
+A third-party Deepnote extension for JupyterLab that provides a read‑only viewer for Deepnote `.deepnote` files.
+
+> **Note:** This is an unofficial, community-developed extension and is not affiliated with or endorsed by Project Jupyter. JupyterLab is a trademark of LF Charities, Inc.
 
 ## Requirements
 
diff --git a/package.json b/package.json
index bc3f50a..ee35a14 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
     "name": "jupyterlab-deepnote",
     "version": "0.1.0",
-    "description": "A Deepnote extension for JupyterLab",
+    "description": "A third-party Deepnote extension for JupyterLab",
     "keywords": [
         "jupyter",
         "jupyterlab",