Macro Won't Appear In Dialog Box

I have some code in a standard module. When I try to run it, it does not appear in the dialog box. The code's below.

Code:
Sub CopyCat(ByVal Target As Excel.Range)
If Target.Column 21 Then Exit Sub
If Target.Value = "Y" Then
Cells(Target.Row, "A").Copy Destination:=Sheets("Sheet2").Range("A" & Rows.Count).End(xlUp).Offset(1)
Cells(Target.Row, "B").Copy Destination:=Sheets("Sheet2").Range("B" & Rows.Count).End(xlUp).Offset(1)
Cells(Target.Row, "C").Copy Destination:=Sheets("Sheet2").Range("C" & Rows.Count).End(xlUp).Offset(1)
Cells(Target.Row, "D").Copy Destination:=Sheets("Sheet2").Range("D" & Rows.Count).End(xlUp).Offset(1)
Cells(Target.Row, "E").Copy Destination:=Sheets("Sheet2").Range("E" & Rows.Count).End(xlUp).Offset(1)
End If
End Sub