diff --git a/README.md b/README.md
index 547520b..bc8f626 100644
--- a/README.md
+++ b/README.md
@@ -2,11 +2,52 @@
 
 HD app is the magic tool that allows the Happy Dev network to thrive in a decentralized way.
 
-## Requirements
+## Use cases
 
-You need to have both NodeJS and NPM installed and working
+Identified and scheduled use cases of the application includes (but are not limited to):
 
-## Install
+- Listing of projects
+- Listing of members
+- Search of members by skills
+- Invoicing and billing
+- Project-scoped chat
+- Personal messaging
+
+### Chat
+
+The repository of the SIB Chat component can be found here:
+
+- https://git.happy-dev.fr/startinblox/sib-chat
+
+It is based on XMPP as messaging protocol, Prosody as the server and ConverseJS as the client.
+
+### Project
+
+The repository of the project listing components is the core and can be found here:
+
+- https://git.happy-dev.fr/startinblox/sib-core
+
+### Invoicing
+
+The invoicing component is still at an early stage. Its repository is here:
+
+- https://git.happy-dev.fr/startinblox/sib-invoicing 
+
+## Architecture
+
+Some general schema of the existing StartinBlox applications architecture can be found here:
+
+https://docs.google.com/presentation/d/1iCRGaJpFvZjhjIUnpsn6lRTJJ31ES6n94BNkJygzUwM/edit?usp=sharing
+
+## Installation
+
+If you want to contribute or test the app, please follow those steps.
+
+### Requirements
+
+You need to have both NodeJS and NPM installed and working.
+
+### Installation process
 
 clone then:
 
@@ -14,12 +55,16 @@ clone then:
 
 ## Build
 
+A first build is mandatory for compiling the static assets.
+
 * `make build`
 
 or
 
 * `make watch`
 
+if you are working on something and want to benefit of the hot reload feature.
+
 ## Run server
 
 * `make serve`