Do you mean that you only want to add new comments on this form, not view old ones?
In this case, add an unbound textbox, txtAddComment, with an AfterUpdate event procedure like this:
Private Sub txtAddComment_AfterUpdate()
If IsNull( txtAddComment ) then exit sub
Dim rs as DAO.Recordset
Set rs = CurrentDb.OpenRecordset( "tblComments" )
with rs
.AddNew
!RecordID = Me.RecordID ' this is the PK of the record on your form - CustomerID or whatever
!CommentDate = Date ' or use Now if you want the time as well
!CommentText = txtAddComment
.Update
.Close
End With
MsgBox "Comment added"
txtAddComment = Null
End Sub
Of course you don't need a subject line - that was just to make it easier to browse the comments.
--
Graham