diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 430063d..d6b8128 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -35,11 +35,13 @@ jobs:
         set -eux
         jlpm run test
 
+    - name: Build packages
+      run: jlpm build
+
     - name: Package the extension
       working-directory: packages/jupyter-chat-extension
       run: |
         set -eux
-
         pip install build
         python -m build
         pip uninstall -y "jupyter_chat_extension" jupyterlab
diff --git a/README.md b/README.md
index 325d6b8..f45270f 100644
--- a/README.md
+++ b/README.md
@@ -2,95 +2,28 @@
 
 [![Github Actions Status](https://github.com/QuantStack/jupyter-chat/workflows/Build/badge.svg)](https://github.com/QuantStack/jupyter-chat/actions/workflows/build.yml)
 
-A chat extension for Jupyterlab
+A chat package for Jupyterlab extension, but also an extension for Jupyterab.
 
-This package is composed of a Python package named `jupyter_chat`
-for the server side and a NPM package named `@jupyter/chat`
-for the frontend side.
+## Composition
 
-## Requirements
+### Typescript package
 
-- JupyterLab >= 4.0.0
+The typescript package is located in *packages/jupyter-chat* and build an NPM
+package named `@jupyter/chat`.
 
-## Install
+This package provides a frontend library (using react), and is intended to be
+used by a jupyterlab extension.
 
-To install the package, execute:
+### Jupyterab extension
 
-```bash
-pip install jupyter_chat
-```
+The Jupyterlab extension is located in *packages/jupyter-chat-extension*.
 
-## Uninstall
+It is composed of a Python package named `jupyter_chat_extension`
+for the server side and a NPM package named `@jupyter/chat-extension`.
 
-To remove the package, execute:
-
-```bash
-pip uninstall jupyter_chat
-```
+This extension is an implementation of the `@jupyter/chat` package, relying on
+websocket for the communication between server and front end.
 
 ## Contributing
 
-### Development install
-
-Note: You will need NodeJS to build the extension package.
-
-The `jlpm` command is JupyterLab's pinned version of
-[yarn](https://yarnpkg.com/) that is installed with JupyterLab. You may use
-`yarn` or `npm` in lieu of `jlpm` below.
-
-```bash
-# Clone the repo to your local environment
-# Change directory to the jupyter_chat directory
-# Install package in development mode
-pip install -e ".[test]"
-# Rebuild Typescript source after making changes
-jlpm build
-```
-
-By default, the `jlpm build` command generates the source maps for this package to make it easier to debug using the browser dev tools.
-
-### Development uninstall
-
-```bash
-pip uninstall jupyter_chat
-```
-
-### Testing the package
-
-#### Server tests
-
-This extension is using [Pytest](https://docs.pytest.org/) for Python code testing.
-
-Install test dependencies (needed only once):
-
-```sh
-pip install -e ".[test]"
-```
-
-To execute them, run:
-
-```sh
-pytest -vv -r ap --cov jupyter_chat
-```
-
-#### Frontend tests
-
-This extension is using [Jest](https://jestjs.io/) for JavaScript code testing.
-
-To execute them, execute:
-
-```sh
-jlpm
-jlpm test
-```
-
-#### Integration tests
-
-This extension uses [Playwright](https://playwright.dev/docs/intro) for the integration tests (aka user level tests).
-More precisely, the JupyterLab helper [Galata](https://github.com/jupyterlab/jupyterlab/tree/master/galata) is used to handle testing the extension in JupyterLab.
-
-More information are provided within the [ui-tests](./ui-tests/README.md) README.
-
-### Packaging the extension
-
-See [RELEASE](RELEASE.md)
+See the contributing part of each package for details.