diff --git a/Hardware:-LiDAR.md b/Hardware:-LiDAR.md
index 1a929e4..d4e5044 100644
--- a/Hardware:-LiDAR.md
+++ b/Hardware:-LiDAR.md
@@ -14,12 +14,13 @@ Hardware ID: `0x0003`
 | `3` | `GET_MAP` | `10 kJ` | Generate the current World's map and copy it to memory |
 | `4` | `GET_WORLD_POS` | `0 kJ` | Copy the current (x,y) coordinates in the Universe in the X and Y registers |
 
-`GET_PATH` generates a path as a direction sequence of 1 word each starting at memory address `0x0000`  
-     `NORTH` = `0x0000`  
+`GET_PATH` generates a path as a direction sequence of 1 word each starting at memory address `0x0000`. The last word in the sequence is `0xAAAA` to indicate the end of the path. A single value of `0xFFFF` is set in memory to indicate an invalid path.   
+`NORTH` = `0x0000`  
 `EAST` = `0x0001`  
 `SOUTH` = `0x0002`  
 `WEST` = `0x0003`  
 
+
 `GET_MAP` generates a map of the current world as a tile sequence of 256 words starting at memory address `0x0100`, each word representing a tile. The LiDAR starts reading the tiles west to east, north to south: (0,0) (1,0) (2,0) ... (15,0) (0,1) (1,1) ...
 
 Each tile is is encoded as a bit field: