Update README.md

TileFormats/Batched3DModel/README.md

@@ -77,7 +77,7 @@ address[1] = {street : 'Main Street', houseNumber : '2'};
 
 [glTF](https://www.khronos.org/gltf) is the runtime asset format for WebGL.  [Binary glTF](https://github.com/KhronosGroup/glTF/tree/master/extensions/Khronos/KHR_binary_glTF) is an extension defining a binary container for glTF.  Batched 3D Model uses glTF 1.0 with the [KHR_binary_glTF](https://github.com/KhronosGroup/glTF/tree/master/extensions/Khronos/KHR_binary_glTF) extension.
 
-Binary glTF immediately follows the batch table.  It begins `12 + batchTableByteLength` bytes from the start of the arraybuffer and continues for the rest of arraybuffer.  It may embed all of its geometry, texture, and animations, or it may refer to external sources for some or all of these data.
+Binary glTF immediately follows the batch table.  It begins `20 + batchTableByteLength` bytes from the start of the arraybuffer and continues for the rest of arraybuffer.  It may embed all of its geometry, texture, and animations, or it may refer to external sources for some or all of these data.
 
 As described above, each vertex has a `batchId` attribute indicating the model to which it belongs.  For example, vertices for a batch with three models may look like this:
 ```
@@ -115,4 +115,4 @@ _TODO, [#60](https://github.com/AnalyticalGraphicsInc/3d-tiles/issues/60)_
 
 ## Acknowledgments
 
-* Jannes Bolling, [@jbo023](https://github.com/jbo023)
+* Jannes Bolling, [@jbo023](https://github.com/jbo023)