To keep comments out of the UI we need to wrap them in ERB tags.

    <%# TODO replace with BL active_sort_fields after BL 5.4.0 upgrade %>

Otherwise it will be printed in the HTML.

![comment](https://cloud.githubusercontent.com/assets/96776/2910541/5cbe158c-d646-11e3-9452-26b69cead6c0.png)