Adding PsiElements to a PsiFile

I'm trying to add a comment at the start of a file.
Easy enough :

PsiElementFactory factory = file.getManager().getElementFactory();
PsiComment comment = factory.createCommentFromText(msg, file);
file.addBefore(comment, file.getFirstChild());

How do I ensure that there is white space between the comment and what was the first line of the file - there is no PsiElementFactory.createWhiteSpace...

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Whitespaces are inserted automatically by PSI engine according to your code style.

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