diff --git a/docs/faq.md b/docs/faq.md
index cfe6ab53e..422487d4e 100644
--- a/docs/faq.md
+++ b/docs/faq.md
@@ -33,19 +33,42 @@ Psy Shell v0.8.8 (PHP 7.1.6 — cli) by Justin Hileman
 
 Cachet has built-in support for:
 
-- MySQL
+- MySQL/MariaDB
 - SQLite
 - PostgreSQL
 - SQL Server
 
 ### Can Cachet support database X?
 
-Cachet is built on the [Laravel](https://laravel.com) framework. By default, Laravel supports the databases listed above but can be extended to support new drivers, so whilst technically possible, it's not within scope of the core team to provide support.
+Cachet is built on the [Laravel](https://laravel.com) framework. By default,
+Laravel supports the databases listed above but can be extended to support
+new drivers, so whilst technically possible, it's not within scope of the
+core team to provide support.
 
-Each new driver requires additional support, testing and maintenance to retain compatibility with the features we want to build into Cachet in the future.
+Each new driver requires additional support, testing and maintenance to
+retain compatibility with the features we want to build into Cachet in the
+future.
 
 ## Support and troubleshooting
 
 ### Do you offer paid support for Cachet?
 
-We have been experimenting with paid support for Cachet at a limited scale. Cachet is not a full-time job, so our time is low and we cannot yet promise that your support request will be dealt with immediately.
+We have been experimenting with paid support for Cachet at a limited scale.
+Cachet is not a full-time job, so our time is low and we cannot yet
+promise that your support request will be dealt with immediately.
+
+## Cachet usage
+
+### Why isn't the _Subscribe_ button enabled?
+
+Cachet checks some informations before displaying the _Subscribe_ button,
+because checking the "Enable subscribers" is not enough.  
+To see the _Subscribe_ button you need to:
+
+- Check the box "Enable subscribers" in the settings.
+- Set the `MAIL_*` option in your `.env` file.
+
+The second item is important, because if your mail is not well configured you
+won't be able to send mails to your subscribers.
+
+> Note: The MAIL\_NAME **is** mandatory too, it is the sender name.