diff --git a/ReadMe.md b/ReadMe.md
index 26866f1..2d2984d 100644
--- a/ReadMe.md
+++ b/ReadMe.md
@@ -50,6 +50,15 @@ This file is semicolon ';' separated and not ',' as usual. The reason is that th
 - Flag: currently not used
 - Auth Key Settings: Optional settings block for the public key entry in the auth file (IP restriction, commands allowed, etc )
 
+The list has to be filled with all hosts for which the admin keys or where user keys should be changed.
+The hostname list depends on the hostnames set in the `.ssh/config` file and the username depends on the OS installed
+
+| OS | Username |
+| - | - |
+| Debian | admin |
+| Ubuntu | ubuntu |
+| Amazon Linux | ec2-user |
+
 ## Scripts
 
 ### `admin-rotate-ssh-keys.sh`