diff --git a/Design-Doc%3A-%60level%60-tool.md b/Design-Doc%3A-%60level%60-tool.md
index 3fe104b..1ed7ef9 100644
--- a/Design-Doc%3A-%60level%60-tool.md
+++ b/Design-Doc%3A-%60level%60-tool.md
@@ -11,7 +11,7 @@ This document details some approaches for implementing the `level` tool.
 ## Converting a Tiled Map Editor Module with `level`
 To convert a Tiled map and tileset:
 ```
-reskit level -i map.tmx -c mapping.toml
+reskit level -i map.tmx -c mapping.toml --map-tile-size 16x16
 ```
 Reskit will compile and output a .lvl file which you can then bundle into your game project. (More information on .lvl format TBD)
 
@@ -40,13 +40,6 @@ health = {
 ## .lvl Format
 The .lvl format is output by the `level` tool. It is a binary format ideal for use on a 8-bit or 16-bit game console. All coordinates use (0,0) upper left as an origin. 
 
-### Header
-* 4 bytes: Magic number, 'LEVL' in ASCII. This is useful to quickly evaluate problems with bundling assets in your build.
-
-### Map Tile Size
-* 1 byte: The width _in number of tiles_ of each entry in the level map. 
-* 1 byte: The height _in number of tiles_ of each entry in the level map.
-
 ### Component Definitions
 * 2 bytes: Number of component definitions