Update readme.md

readme.md

@@ -144,12 +144,12 @@ These are the steps to get your Ruby Usergroup Site:
 - Create a GitHub Pull Request
 - *Lean back and wait :)*
 
-If you have a custom domain, you need to set up the [CNAME of your domain to
-point to Heroku](https://devcenter.heroku.com/articles/custom-domains#dns_setup).
+If you have a custom domain, you need to [configure the DNS](https://github.com/phoet/on_ruby/issues/360#issuecomment-459729483).
 
 On the admin site we need to:
 
 - `heroku domains:add xyz.onruby.de [custom.de]`
+- pull the custom domain into cloudflare
 - create a new GitHub app for that domain and add keys via `heroku config:add`
 - merge the Pull Request
 - deploy to Heroku