diff --git a/README.md b/README.md
index eedd120..b90125c 100644
--- a/README.md
+++ b/README.md
@@ -12,33 +12,71 @@ Why using configuration?...
 ------------------------
 ...instead use stared project of your Github account?
 Cause I've got about 80 "stared" projects and I don't wan't to be alerted for new releases of each of these project.
-But, perhaps I'll add such a feature later on...
 
 And, Github API limits is at 60 requests by seconds, and I want to write this script really quickly in a first time.
 
+But, perhaps I'll add such a feature later on...
+
 How to use?
 -----------
 Really simple!
 
-* Edit conf.ini file to set `[config]` section
+* Install dependances: `pip install -r requirements.txt`
+* Edit conf.ini file to set `[config]` section:
   * your SMTP server configuration (host and port)
   * sender mail
   * receiver mail (:warning: not tested with more than 1 receiver)
-* Add the projects you want to follow in the section `[project]`
+* ...or use environment variable - same name but in upper case e.g. `SMTP_PORT`
+* Add projects you want to follow in the section `[project]`
   * Be careful to follow a JSON valid syntax as in the provided file, i.e. coma after each `autor/project` except the last one.
 
+Execute the script: `python notifier.py`
+
 After first execution, the `conf.ini` file will be filled with last release tag found by the script, as you can see in the provided file.
 
 Hope you like, and have fun to read your mail!
 
+Hey, what is this API?
+--------------------------
+Since it's not really conveniant to go on a VM and edit the config.ini every time I find a cool new project whose new versions I want to keep track of, there is an API to do this.
+
+This is a really simple thing with no verification: you can add everything that you want!
+
+Just one endpoint: `subscription`, and two method: GET and PUT.
+PUT take three parameters:
+* `project`: full project name e.g. `MaxenceG2M/github-release-notifier` or "short" name (without author) e.g. `github-release-notifier`
+* (optionnal) `author`: the author of the repository
+* (optionnal) `credentials`: just the TOTP check code.
+
+Indeed, to have a minimal better-than-nothing protection, I opted for a simple TOTP code. No user/password or wathever.
+You can disable-it in the `config.ini`, or specify a custom key.
+If you don't specify a key, information will be displayed at startup (URL and the actual code. Be quick to check if it's ok!).
+
+To start the API:
+```sh
+$ uvicorn notifier:app
+TOTP enabled.
+    Information: otpauth://totp/Secret?secret=mysuperkey
+    TOTP check: 377826
+INFO:     Started server process [28264]
+INFO:     Waiting for application startup.
+INFO:     Application startup complete.
+INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
+```
+
+Cron-it with [ofelia](https://github.com/mcuadros/ofelia)
+---------------------------------------------------------
+Ofelia is very conveniant for croning the verification part while letting the API run continuously.
+So the `docker-compose.yml` use it to do this :)
+
+<3
+
 Problems I have to solve really quickly
 ---------------------------------------
-I wrote this script really quickly, certainly faster than this README. So I already have two big proglems:
-* The script sends mail even if no new projets or release has been detected
-* The biggest, you have to edit script to specify absolute path...
-* A lot of other little problems, like the code that's disgusting and so on.
+One script to do all things.
 
-For who's asking: yes, it's normal that I have put all code in one main function [like a blind gunner.](https://media.giphy.com/media/1yMexL5rkwYhuiVEmZ/giphy.gif). Really quickly I said!
+For who's asking: yes, it's normal that I have put all code in ~~one main function~~ one main script [like a blind gunner.](https://media.giphy.com/media/1yMexL5rkwYhuiVEmZ/giphy.gif).
+I want to keep this script as simple as possible.
 
 But overall, the script works and sends mail!