diff --git a/papermerge/README.md b/papermerge/README.md
index f2b16c0bf..b5d57cffb 100644
--- a/papermerge/README.md
+++ b/papermerge/README.md
@@ -31,9 +31,11 @@ comparison to installing any other Hass.io add-on.
 ## Configuration
 
 Default login is admin:admin via the webui, accessible at http://SERVERIP:PORT
-
 Webui can be found at `<your-ip>:8000`.
 
+Options can be configured through two ways :
+
+- Addon options
 ```yaml
 GUID: user
 GPID: user
@@ -44,6 +46,11 @@ cifsusername: "username" # smb username (optional)
 cifspassword: "password" # smb password (optional)
 ```
 
+- Config.yaml
+Custom env variables can be added to the config.yaml file referenced in the addon options.
+Full env variables can be found here : https://papermerge.readthedocs.io/en/v1.4.2/settings.html. 
+It must be entered in a valid yaml format, that will be verified at launch of the addon.
+
 [repository]: https://github.com/alexbelgium/hassio-addons
 [aarch64-shield]: https://img.shields.io/badge/aarch64-yes-green.svg
 [amd64-shield]: https://img.shields.io/badge/amd64-yes-green.svg