diff --git a/README.md b/README.md
index 23e76fd..dcf3b8d 100644
--- a/README.md
+++ b/README.md
@@ -8,11 +8,11 @@ Tested on Cygwin, should work on Linux distros.
 
 ## iCloud and iMessage connectivity
 
-iCloud and iMessage and other connected Apple services require a valid device serial number. Set it before the installation by replacing the zeroes in `serialnumber="000000000000"` with a valid serial number, or after the installation with `VBoxManage setextradata "${vmname}" "VBoxInternal/Devices/efi/0/Config/DmiSystemSerial" "${serialnumber}"`. An invalid serial number that matches the correct structure for the device name and board ID might work, too.
+iCloud and iMessage and other connected Apple services require a valid device serial number. Set it before the installation by replacing the zeroes in `serialnumber="NOTAVALIDSN0"` with a valid serial number, or after the installation with `VBoxManage setextradata "${vmname}" "VBoxInternal/Devices/efi/0/Config/DmiSystemSerial" "${serialnumber}"`. An invalid serial number that matches the correct structure for the device name and board ID might work, too.
 
 ## Dependencies
 
 * [VirtualBox](https://www.virtualbox.org/wiki/Downloads)≥5.2
 * `Bash`≥4 (run on Windows through [Cygwin](https://cygwin.com/install.html))
 * `unzip`, `wget` (install through package manager)
-* `dmg2img` (install through package manager on Linux; let the script download it automaticall on Windows)
+* `dmg2img` (install through package manager on Linux; let the script download it automatically on Windows)