Appending text to an existing footer

Because of GDPR, the company I work for needs to append “CONFIDENTIAL” to the end of every document. I’ve written a powershell script to append text to the footer but when it runs, the existing footer loses its formatting. Here’s my code(only for one document at the minute):

$word = New-Object -ComObject Word.Application
$word.Visible = $false
$document = $word.Documents.Open("C:\temp\Doc1.docx")
foreach ($section in $document.Sections) {
    $footer = $section.Footers.Item(1)
    $currentText = $footer.Range.Text
    $footer.Range.Text = $currentText + "CONFIDENTIAL"

How can I make this append the text without losing all the footers existing formatting?

This works for me…

$footer.Range.Text = $currentText + "`r`nCONFIDENTIAL"