diff --git a/Design-Doc%3A-%60level%60-tool.md b/Design-Doc%3A-%60level%60-tool.md
index 972b962..0dd107b 100644
--- a/Design-Doc%3A-%60level%60-tool.md
+++ b/Design-Doc%3A-%60level%60-tool.md
@@ -14,8 +14,8 @@ To convert a Tiled map and tileset:
 reskit level -i map.tmx -c mapping.toml --system md --tile-size 2x2
 ```
 Reskit will compile and output a .lvl file and related artifacts (depending on `--system` setting) which you can then bundle into your game project
-## System Layers
-The string property `reskit-layer` set on a Tile Layer indicates which layer should be used for which hardware layer in your system of choice. Valid options:
+## Graphics Layers
+The string property `reskit-layer` set on a Tile Layer indicates which layer should be applied to which hardware layer in your system of choice. Valid options:
 
 ### Sega Mega Drive `--system md`
 * `a`/`A` for Plane A