Excel VBA - Add Comment On Change To Cell Value

I am looking to have a select few cells generate a comment when the user changes their value. I don't want the entire sheet to be affected as it will only apply to the header row of columns J:P.

I'm not sure if it matters but I have the worksheet protected and the cells in question are unlocked.

Below is an example of the code I'm trying to get to work.

Option Explicit
Public preValue As Variant
Private Sub worksheet_change(ByVal Target As Range)
End Sub
If Target.Count > 1 Then Exit Sub
Target.ClearComments

[Code] .......