tag inside lexicographicResource

In the Comments section on lexicographicResource one can read:
" The other object type that can optionally occur inside a lexicographicResource, tag, is for lists of look-up values such as part-of-speech labels."
but tag is not listed as an allowed property of lexicographicResource. Is the comment an erroneous artifact of some past discussions (I hope so!) to be removed?
Best  Mios
Milos Jakubicek
CEO, Lexical Computing  Brno, CZ
Brighton, UK
http://www.lexicalcomputing.com
http://www.sketchengine.eu