# Changes in version 2017.1.0

FIAT 2017.1.0 was released on 2017-05-09.

## Summary of changes

- Extended the discontinuous trace element `HDivTrace` to support tensor product reference cells. Tabulating the trace defined on a tensor product cell relies on the argument `entity` to specify a facet of the cell. The backwards compatibility case `entity=None` does not support tensor product tabulation as a result. Tabulating the trace of triangles or tetrahedron remains unaffected and works as usual with or without an entity argument.