Set up slack alert based on a field changing from one option to any other

Set up slack alert based on a field changing from one option to any other

Hi,

I'm trying to set-up a workflow to send a slack alert if a field changes from one option to any other.

I've set-up a workflow to trigger on Edit and when a specific field gets modified but the only option I have 'is modified to' when really it should be 'is modified from' and I am not sure how to work with it.

Any ideas?