diff --git a/Object-Model.md b/Object-Model.md
index 5746ade..3bfa512 100644
--- a/Object-Model.md
+++ b/Object-Model.md
@@ -18,7 +18,7 @@ Both `grid` and `pack` objects include data representing voronoi diagrams and th
 * `grid.cellsY`: `number` - number of cells in column
 * `grid.cellsX`: `number` - number of cells in row
 * `grid.points`: `number[][]` -  initial coordinates `[x, y]` based on jittered square grid. Numbers rounded to 2 decimals
-* `grid.boundary`: `number[][]` - coordinates or out-of-canvas points used to cut the diagram approximately by canvas edges. Integers
+* `grid.boundary`: `number[][]` - coordinates of out-of-canvas points used to cut the diagram approximately by canvas edges. Integers
 * `grid.cells`: `{}` - cells data object, including voronoi data:
 * * `grid.cells.i`: `number[]` - cell indexes `Uint16Array` or `Uint32Array` (depending on cells number)
 * * `grid.cells.c`: `number[][]` - indexes of cells adjacent to each cell (neighboring cells)