diff --git a/engine/tiles.go b/engine/tiles.go
index 641eb58..b07838c 100644
--- a/engine/tiles.go
+++ b/engine/tiles.go
@@ -8,7 +8,7 @@ import (
 
 type Tilemap struct {
 	Map      [][]int
-	Src      *ebiten.Image
+	Src      *ebiten.Image // must be a horizontal tile set
 	TileSize int
 	GeoM     ebiten.GeoM
 
diff --git a/main.go b/main.go
index 932a368..8d0c7d3 100644
--- a/main.go
+++ b/main.go
@@ -12,7 +12,7 @@ import (
 
 const screenWidth, screenHeight = 320, 240
 
-//go:embed assets/*
+//go:embed assets
 var assets embed.FS
 
 func main() {