better comment

attr_json.gemspec

@@ -42,8 +42,10 @@ attributes use as much of the existing ActiveRecord architecture as we can.}
 
   spec.required_ruby_version = '>= 2.6.0'
 
-  # Only to get CI to work on versions of Rails other than we release with,
-  # should never release a gem with RAILS_GEM set!
+  # This conditional is only to get CI to work on versions of Rails other than
+  # we release with. The gem should never be released without the activerecord
+  # dependency included just as it is here, should never be released
+  # from an env tht has any of these variables set.
   unless ENV['APPRAISAL_INITIALIZED'] || ENV["TRAVIS"] || ENV['CI']
     spec.add_runtime_dependency "activerecord", ">= 6.0.0", "< 7.1"
   end