Update CHANGES.

CHANGES.md

@@ -1096,9 +1096,9 @@ TODO
 
 ## [Voronoi Diagrams (d3-voronoi)](https://github.com/d3/d3-voronoi/blob/master/README.md)
 
-The d3.geom.voronoi method has been renamed to [d3.voronoi](https://github.com/d3/d3-voronoi#voronoi), and the *voronoi*.clipExtent method has been renamed to [*voronoi*.extent](https://github.com/d3/d3-voronoi#voronoi_extent). The undocumented *polygon*.point property in 3.x, which is the *i*th element in the input *data*, has now been renamed to *polygon*.data for consistency.
+The d3.geom.voronoi method has been renamed to [d3.voronoi](https://github.com/d3/d3-voronoi#voronoi), and the *voronoi*.clipExtent method has been renamed to [*voronoi*.extent](https://github.com/d3/d3-voronoi#voronoi_extent). The undocumented *polygon*.point property in 3.x, which is the element in the input *data* corresponding to the polygon, has been renamed to *polygon*.data.
 
-Calling [*voronoi*](https://github.com/d3/d3-voronoi#_voronoi) now returns the full [Voronoi diagram](https://github.com/d3/d3-voronoi#voronoi-diagrams), which includes topological information: each Voronoi edge exposes *edge*.left and *edge*.right specifying the sites on either side of the edge, and each Voronoi cell is an array of edges. The Voronoi diagram can be used to efficiently compute both the Voronoi and Delaunay tessellations for a site of points: [*diagram*.polygons](https://github.com/d3/d3-voronoi#diagram_polygons), [*diagram*.links](https://github.com/d3/d3-voronoi#diagram_links), and [*diagram*.triangles](https://github.com/d3/d3-voronoi#diagram_triangles). The topology is also useful in conjunction with TopoJSON; see the [Voronoi topology example](http://bl.ocks.org/mbostock/cd52a201d7694eb9d890).
+Calling [*voronoi*](https://github.com/d3/d3-voronoi#_voronoi) now returns the full [Voronoi diagram](https://github.com/d3/d3-voronoi#voronoi-diagrams), which includes topological information: each Voronoi edge exposes *edge*.left and *edge*.right specifying the sites on either side of the edge, and each Voronoi cell is defined an array of these edges and a corresponding site. The Voronoi diagram can be used to efficiently compute both the Voronoi and Delaunay tessellations for a set of points: [*diagram*.polygons](https://github.com/d3/d3-voronoi#diagram_polygons), [*diagram*.links](https://github.com/d3/d3-voronoi#diagram_links), and [*diagram*.triangles](https://github.com/d3/d3-voronoi#diagram_triangles). The new topology is also useful in conjunction with TopoJSON; see the [Voronoi topology example](http://bl.ocks.org/mbostock/cd52a201d7694eb9d890).
 
 The [*voronoi*.polygons](https://github.com/d3/d3-voronoi#voronoi_polygons) and [*diagram*.polygons](https://github.com/d3/d3-voronoi#diagram_polygons) now require an [extent](https://github.com/d3/d3-voronoi#voronoi_extent); there is no longer an implicit extent of ±1e6. The [*voronoi*.links](https://github.com/d3/d3-voronoi#voronoi_links), [*voronoi*.triangles](https://github.com/d3/d3-voronoi#voronoi_triangles), [*diagram*.links](https://github.com/d3/d3-voronoi#diagram_links) and [*diagram*.triangles](https://github.com/d3/d3-voronoi#diagram_triangles) are now affected by the clip extent: as the Delaunay is computed as the dual of the Voronoi, two sites are only linked if the clipped cells are touching. To compute the Delaunay triangulation without respect to clipping, set the extent to null.