VB Code to Hide Columns

Hi there,

I am very new to VB coding in Excel so would really appreciate your expertise on this

I have a spreadsheet where I am hiding certain columns (all on the same worksheet) when a checkbox is ticked, I managed to get it working where there are consecutive columns using the below code:

Private Sub DomainRequestorColumns_Click()

If Range("C:S").EntireColumn.Hidden = True Then
Range("C:S").EntireColumn.Hidden = False
Else
Range("C:S").EntireColumn.Hidden = True
End If

End Sub

This works perfectly but I need to add a column AU and I can't for the life of me figure out how to do this?

Can you perhaps advise me on how I can do this please?

Thanks in advance,
Angela