editing layer's mask

[Nikolai Vladychevski]

Hi,

I applied mask to a layer, but now I want to modify it and I can't find
any way how to do this. There is nothing like "Modify Layer Mask"
option. I tryed creating a new channel and modify alpha values but it
doesn't modify the alpha values of the Layer Mask. What to do now?
(gimp 1.1.24)

Please, help.

Thank you
Nikolai