The site carries a formal monument designation, which means it has been identified and catalogued as something worth protecting, yet the specifics of what it actually is, how old it might be, and what shape or scale it takes on the ground have not been made available. An enclosure, in the broad archaeological sense, refers to any defined area bounded by a bank, ditch, wall, or combination of these, and such features in Ireland range from prehistoric ringforts and ceremonial sites to early medieval farmsteads and later field boundaries. Which of these categories Frenchbrook's enclosure belongs to remains an open question, at least in terms of what can currently be established from the public record.

The placename Frenchbrook is itself suggestive. The French element appears elsewhere in Irish townland names and is generally associated with the Norman or later Anglo-Norman presence in Ireland, families who arrived in the wake of the twelfth-century invasion and whose descendants held land across Connacht for generations. Whether that etymology bears any relation to the enclosure, or whether the two are entirely separate layers of the same landscape, is impossible to say without further documentation. Mayo as a whole contains a dense concentration of earthwork monuments, many of them poorly understood and some only recently recognised through aerial survey or lidar mapping, so the gap in the record here is not unusual, even if it is frustrating.