diff --git a/Design-Doc%3A-%60level%60-tool.md b/Design-Doc%3A-%60level%60-tool.md
index 63223af..689cd1f 100644
--- a/Design-Doc%3A-%60level%60-tool.md
+++ b/Design-Doc%3A-%60level%60-tool.md
@@ -38,17 +38,26 @@ 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.
+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.
+* 4 bytes: Magic number, 'LEVL' in ASCII. This is useful to quickly evaluate problems with bundling assets in your build.
 
 ### Map Unit Size
-1 byte: The unit size for each tile. On Sega Mega Drive this is 8, for 8x8 tile.
+* 1 byte: The unit size for each tile. On Sega Mega Drive this is 8, for 8x8 tile.
 
 ### Map Tile Size
-1 byte: The width _in number of tiles_ of each entry in the level map. 
+* 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.
 
-1 byte: The height _in number of tiles_ of each entry in the level map.
+### Component Data
+(TBD !!(
+
+### Entity Data
+* 2 bytes: The number of entities.
+
+For (number of entities):
+   * 1 byte: X position of entity
+   * 1 byte: Y position of entity
 
 (TBD !!)
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