setting :rspec => false doesn't disable running rspec

[tgaff]

In guard-zeus (2.0.1)

In my guardfile:
guard 'zeus', run_all: false, rspec: false do

Despite this everytime I modify an rspec file that file is run. I can disable this only by removing the watch on those files. Now admittedly that makes a little sense... why would I watch those files if I don't care. (I had originally just wanted to disable spec running temporarily. )

However, I'm confused by the purpose of rspec: false if it doesn't disable running specs automatically what does it do?