The language has been described by Harland Kerr, a missionary who lived in the Wiru community for many years.

Kerr's work with the community produced a Wiru Bible translation and several unpublished dictionary manuscripts,[3] as well as Kerr's Master's thesis on the structure of Wiru verbs.

The following basic vocabulary words are from Franklin (1973,[6] 1975),[7] as cited in the Trans-New Guinea database:[8] Wiru has a general noun-modifying clause construction.

Such constructions can be used to express a wide range of semantic relationships between clause and noun.

[Toro pea skul ke poa-rok-o] oi no-ka-l-e...1PL all school LOC go-OPT-1PL time come-PST-DS-2/3PL...'The time for all of us to go to school arrived...'The noun-modifying clause construction imposes a falling tone on the head noun.