class Rails::Command::Base

def desc(usage = nil, description = nil, options = {})

root.
Tries to get the description from a USAGE file one folder above the command 
def desc(usage = nil, description = nil, options = {})
  if usage
    super
  else
    @desc ||= ERB.new(File.read(usage_path), trim_mode: "-").result(binding) if usage_path
  end
end