Why VOR information(mark) on ILS approach chart?

[mjkim]

Hi there,

First of all, please understand me if I make incorrect grammatic order or sentences(Because my english is Very poor)

Could you please let me know why, there's VOR information in the ILS approach chart?

The ILS approach as I know, the VOR signal is not mandatory to operate ILS approach ( to reach IAF, we might need VOR information but why that information in the approach chart like ILS?)

so, if there's VOR information in the chart(except VOR approach), is that for reference information? or Did I miss or have misunderstanding about the ILS approach ?

Thanks