diff --git a/src/world.rs b/src/world.rs
index d928e79..81466d3 100644
--- a/src/world.rs
+++ b/src/world.rs
@@ -57,6 +57,7 @@ pub struct ChunkLocalTilePos {
     pub y: ChkLocalTPosSc,
 }
 
+/// Chunk-local tile position scalar. Supports up to 256 tiles per chunk.
 type ChkLocalTPosSc = u8;
 
 impl TilePos {