Code to show when a cell was updated, for several columns

I have this code which will show when a cell has been updated in column P.

I would like it to also update for columns C, K, P & Q Too.

Is that possible?

Any help appreciated.

Private Sub Worksheet_Change(ByVal Target As Range)
'Update 20140722
Dim WorkRng As Range
Dim Rng As Range
Dim xOffsetColumn As Integer
Set WorkRng = Intersect(Application.ActiveSheet.Range("p:p"), Target)
xOffsetColumn = 15
If Not WorkRng Is Nothing Then
    Application.EnableEvents = False
    For Each Rng In WorkRng
        If Not VBA.IsEmpty(Rng.Value) Then
            Rng.Offset(0, xOffsetColumn).Value = Now
            Rng.Offset(0, xOffsetColumn).NumberFormat = "dd-mm-yyyy, hh:mm:ss"
        Else
            Rng.Offset(0, xOffsetColumn).ClearContents
        End If
    Next
    Application.EnableEvents = True
End If
End Sub