docs: def add_threading(self, flag):
  		"""
  		Indicates that this wrapper should use threading by appending an
  		argument with the specified `flag` followed by the number of threads
  		specified in the BioLite configuration file.
  		"""
  		threads = min(int(config.get_resource('threads')), self.max_concurrency)
  		if threads > 1:
  			self.args.append(flag)
  			self.args.append(threads)