diff --git a/Design-Doc%3A-%60level%60-tool.md b/Design-Doc%3A-%60level%60-tool.md
index 7d7a59b..ba958e0 100644
--- a/Design-Doc%3A-%60level%60-tool.md
+++ b/Design-Doc%3A-%60level%60-tool.md
@@ -57,7 +57,7 @@ health = {
 This is a system-specific binary format of tiles formatted for your target system. Normally you would take this data and DMA it to the VRAM in your homebrew.
 
 ### `--console md`
-* Output format is identical to `tileset` i.e. it is a colour palette followed by a set of tiles in tile order.
+* Output format is identical to `tileset` i.e. it is a colour palette followed by a set of tiles in tile order. Two .bin files are output in `--console md` mode: by default, they are named `plane_b.bin` and `plane_a.bin`. This allows you to manually place them along 128KB boundaries so that DMA works properly.
 
 ## .map Format (Tile Map)
 While the above format contains the graphics, this contains the nametable settings for each layer i.e. pointers to entries in the above list of tiles for each region of the screen. Normally you would take this data and DMA it to the VRAM in your homebrew, where the pattern map nametable is set.