diff --git a/README.md b/README.md
index 4bc368f..dc39766 100644
--- a/README.md
+++ b/README.md
@@ -5,3 +5,7 @@ The "one key" is enter, which has to be pressed whenever the virtual machine is
 The goal of the script is to allow for a very easy installation without any closed-source additions or extra bootloaders.
 
 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. If you own a Mac, use yours. An invalid serial number that matches the correct structure for the device name and board ID might work, too.