diff --git a/typesetter.go b/typesetter.go
index a8f360a..e48ddb4 100644
--- a/typesetter.go
+++ b/typesetter.go
@@ -47,6 +47,7 @@ func (tok token) String () string {
 		tok.position.X, tok.position.Y, tok.width)
 }
 
+// TODO: perhaps rename this to just "glyph"
 type runeLayout struct {
 	x   fixed.Int26_6
 	run rune