diff --git a/src/Symfony/Component/Notifier/Bridge/FreeMobile/README.md b/src/Symfony/Component/Notifier/Bridge/FreeMobile/README.md
index a117b04c6660d..e48257483f6f9 100644
--- a/src/Symfony/Component/Notifier/Bridge/FreeMobile/README.md
+++ b/src/Symfony/Component/Notifier/Bridge/FreeMobile/README.md
@@ -5,6 +5,21 @@ Provides Free Mobile integration for Symfony Notifier.
This provider allows you to receive an SMS notification
on your personal mobile number.
+DSN example
+-----------
+
+```
+// .env file
+FREE_MOBILE_DSN=freemobile://LOGIN:PASSWORD@default?phone=PHONE
+```
+
+where:
+ - `LOGIN` is your Free Mobile login
+ - `PASSWORD` is the token displayed in your account
+ - `PHONE` is your Free Mobile phone number
+
+See your account info at https://mobile.free.fr/moncompte/index.php?page=options
+
Resources
---------
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