How to insert a carriage return chr(13) to a message box

On my form I have a button, called "Instruction".

When the user clicks on it, I present him with a message box expalining key points about the form and the fields.

Here a dummy example:

xfa.host.messageBox("Hello Everyone! The form contains 5 required field identied by Red border. Make sure you fill them before submitting the form. To calculate the winner percentage you Must fill in the number of tables first."

, "INSTRUCTION", 3);

There must be a way to insert a line in a message box, such as chr(13).

What's the syntax?