html.rb in nanoc-4.0.0a1

- old
+ new

@@ -1,7 +1,8 @@
 # encoding: utf-8
 
 module ::Nanoc::Extra::Checking::Checks
+  # @api private
   class HTML < ::Nanoc::Extra::Checking::Check
     identifier :html
 
     def run
       require 'w3c_validators'