Outlook Email with Body from Excel

The following code works great for me to send an email file from Excel to Outlook automatically. However, I want to add a body to the message and cannot figureout where and how to add it to this code. Let's say for example, that I want to say "See attached." How would I add this? I tried .body = "See attached." but this is not working.

Sub Relay()
'Working in 97-2010
    Dim wb As Workbook
    Dim I As Long


    Set wb = ActiveWorkbook

    If Val(Application.Version) >= 12 Then
        If wb.FileFormat = 51 And wb.HasVBProject = True Then
            MsgBox "There is VBA code in this xlsx file, there will" & vbNewLine & _
                   "be no VBA code in the file you send. Save the" & vbNewLine & _
                   "file first as xlsm and then try the macro again.", vbInformation
            Exit Sub
        End If
    End If

    On Error Resume Next
    For I = 1 To 3
        wb.SendMail "Jarret Test", _
                    "System Discharge Report"
    
        If Err.Number = 0 Then Exit For
    Next I
    On Error GoTo 0
End Sub