diff --git a/Object-Model.md b/Object-Model.md
index 47045f4..a417135 100644
--- a/Object-Model.md
+++ b/Object-Model.md
@@ -17,13 +17,29 @@ Both `grid` and `pack` objects include data representing voronoi diagrams and th
 * `grid.spacing`: `number` - spacing between points before jirrering
 * `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 are rounded to 2 decimals
+* `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.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)
 * * `grid.cells.v`: `number[][]` - indexes of vertices of each cell
+* * `grid.cells.b`: `number[]` - indicator whether the cell borders the map edge, 1 if `true`, 0 if `false`. Integers, not Boolean
 
 * `grid.vertices`: `{}` - vertices data object, contains only voronoi data:
 * * `grid.vertices.p`: `number[][]` - vertices coordinates `[x, y]`, integers
 * * `grid.vertices.c`: `number[][]` - indexes of cells adjacent to each vertex, each vertex has 3 adjacent cells 
-* * `grid.vertices.v`: `number[][]` - indexes of vertices adjacent to each vertex. Most vertices have 3 neighboring vertices, bordering vertices has only 2, while the third is still added to the data as `-1`
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+* * `grid.vertices.v`: `number[][]` - indexes of vertices adjacent to each vertex. Most vertices have 3 neighboring vertices, bordering vertices has only 2, while the third is still added to the data as `-1`
+
+### Pack object
+* `pack.cells`: `{}` - cells data object, including voronoi data:
+* * `pack.cells.i`: `number[]` - cell indexes `Uint16Array` or `Uint32Array` (depending on cells number)
+* * `pack.cells.p`: `number[][]` -  cells coordinates `[x, y]` after repacking. Numbers rounded to 2 decimals
+* * `pack.cells.c`: `number[][]` - indexes of cells adjacent to each cell (neighboring cells)
+* * `pack.cells.v`: `number[][]` - indexes of vertices of each cell
+* * `pack.cells.b`: `number[]` - indicator whether the cell borders the map edge, 1 if `true`, 0 if `false`. Integers, not Boolean
+* * `pack.cells.g`: `number[]` - indexes of a source cell in `grid`. `Uint16Array` or `Uint32Array`. The only way to find correct `grid` cell parent for `pack` cells
+
+* `pack.vertices`: `{}` - vertices data object, contains only voronoi data:
+* * `pack.vertices.p`: `number[][]` - vertices coordinates `[x, y]`, integers
+* * `pack.vertices.c`: `number[][]` - indexes of cells adjacent to each vertex, each vertex has 3 adjacent cells 
+* * `pack.vertices.v`: `number[][]` - indexes of vertices adjacent to each vertex. Most vertices have 3 neighboring vertices, bordering vertices has only 2, while the third is still added to the data as `-1`
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