diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 # ansible-plume
-
+## Explenation 
 A Ansible playbook to install and upgrade [Plume](https://github.com/Plume-org/Plume).
 This role install Plume without reverse proxy, backup, or PostgreSQL and it needs to be used with PostgreSQL.
 
@@ -7,7 +7,20 @@ The [vars.yml](https://git.drycat.fr/Dryusdan/ansible-plume/src/branch/master/va
 Theses variables are used in `.env` file.
 There are listed on [the Plume's doc](https://docs.joinplu.me/environment/).
 
+## How to use it ?
+First, you need to [install Ansible](https://docs.ansible.com/ansible/latest/installation_guide/intro_installation.html). You need also make Ansible inventory... (French article : https://noskillbrain.fr/2017/10/18/ansible/ and https://www.cyphercat.eu/deploiement-et-automatisation-avec-ansible-partie-1/ ).
+After you need to clone this repo in your roles folder.
 
+YOu need tip this command : 
+```
+ansible-playbook -i hosts plume.yml
+```
+
+And that all, Plume is installed (or updated).
+
+If you want a good Ansible Playbook for PostgreSQL, I recommand this : https://github.com/geerlingguy/ansible-role-postgresql
+
+## List of variables 
 
 | Varibles | Explanation |
 | -------- | -------- |