diff --git a/typesetter.go b/typesetter.go
index e48ddb4..f4df0e7 100644
--- a/typesetter.go
+++ b/typesetter.go
@@ -89,7 +89,7 @@ type TypeSetter struct {
 	layoutBoundsSpace fixed.Rectangle26_6
 }
 
-// Runes returns an iterator for all runes in the TypeSetter, and thier positions.
+// Runes returns an iterator for all runes in the TypeSetter, and their positions.
 func (this *TypeSetter) Runes () RuneIter {
 	this.needFlow()
 	return func (yield func (fixed.Point26_6, rune) bool) {