diff --git a/doc/ADMIN.md b/doc/ADMIN.md
new file mode 100644
index 0000000..71af978
--- /dev/null
+++ b/doc/ADMIN.md
@@ -0,0 +1,44 @@
+# Admin notebook of YunoHost's AdGuard Home
+
+You want to be sure to understand the config settings? You're at the right place! ^w^
+
+## Expose port 53 to the Internet?
+
+This setting is **disabled** by default.
+
+You need to know that anyone who knows your server's IP can make a DNS request to it. It may be used to perform [amplification attacks](https://en.wikipedia.org/wiki/Denial-of-service_attack#Amplification)!
+
+To use AdGuard Home in your domestic network, you don't need to activate this.  
+You simply have to use your local IP adress (like `192.168.0.1` or so) as DNS IP for your IT hardware at home
+
+Warning: you should not have public IPs of the config file if the port 53 is not exposed on Internet (else: AGH crashes)  
+You can remove them in your config file `/var/www/adguardhome/AdGuardHome.yaml` in the `dns: bind_hosts:` section
+Any IP that doesn't start with the folowing are public ones:
+
+- `10.`
+- `169.`
+- `172.`
+- `192.168.`
+- `fdxx:` (where the `x` can be any hexadecimal character)
+- `fe80:`
+
+So, any other IP should be a public one.
+
+Restart AdGuard Home after applying the needed edits:
+`yunohost service restart adguardhome`
+
+## Enable DNS over HTTP and DNS over QUIC?
+
+This setting is **disabled** by default.
+
+You need to know that anyone who knows your AdGuard Home domain-name can make a DNS request to it. It may be used to perform [amplification attacks](https://en.wikipedia.org/wiki/Denial-of-service_attack#Amplification)!
+
+It's really important to use the configuration panel to deactivate this setting, and **NOT** the built-in setting in the AdGuardHome interface.  
+This is because YunoHost needs to perform actions such as automatically opening or closing the server's ports, which cannot be done without going through the configuration panel.
+
+If you host your machine at home, for using DoH or DoQ, you have to open the following ports on your router:
+
+- `853` in TCP & UDP (for DNS over HTTP)
+- `784` in UDP (for DNS over QUIC)
+
+Then you can use `https://adguard.example.com/dns-query` (where `adguard.example.com` is the domain-name associated to your AdGuard Home) as a DoH or DoQ DNS server for your devices. ^w^
diff --git a/doc/PRE_UPGRADE.d/0.107.43~ynh4 b/doc/PRE_UPGRADE.d/0.107.43~ynh4
index ec88101..dc521a0 100644
--- a/doc/PRE_UPGRADE.d/0.107.43~ynh4
+++ b/doc/PRE_UPGRADE.d/0.107.43~ynh4
@@ -5,4 +5,9 @@ From this 0.107.43~ynh4 version, some things have changed:
 To activate either of these features, please use the config panel:  
 Applications → AdGuard Home → AdGuard Home configuration  
 - Expose port 53 to the Internet?  
-- Enable DNS-over-HTTPS/QUIC?
\ No newline at end of file
+- Enable DNS-over-HTTPS/QUIC?
+
+This update is at risk of crashing AdGuard Home
+
+If any trouble or question, please refer to [the package's admin docs](https://github.com/YunoHost-Apps/adguardhome_ynh/blob/master/doc/ADMIN.md)! ^w^  
+If needed and a similar issue does not already exist, please [open an issue on the GitHub's package page](https://github.com/YunoHost-Apps/adguardhome_ynh/issues)!