     @_commands.push command
 
 
-  # Add a selector to _selectors, if not already in the list.
+  # Add a selector to @_selectors, if not already in the list.
   # @private
   #
   # @param selector [String] A selector.

    return selector


  # Create an object containing @commands and @selectors.
  # @private
  #
  # @return [Object] An object consisting of commands and selectors.

  _selectors: null


  # Add a command to @_commands.
  # @private
  #
  # @param command [Array]
