Ohai command not pulling in custom plugin

Ohai.plugin(:myPlugin) do
  provides 'my_asset_tag'

  collect_data do
    my_uid = File.open('/usr/local/lp/etc/lp-UID').first.chomp
    my_asset_tag my_uid

The plugin shows up in the /etc/chef/ohai directory and if I run ohai -d /etc/chef/ohai the plugin shows up but just running ohai my attribute doesn't show.

It does show if run knife node show server -a my_asset_tag but was hoping to have it show up by running just ohai.

Any help would be greatly appreciated.