diff --git a/color.go b/color.go
index 9253a5583b..a471a79f2d 100644
--- a/color.go
+++ b/color.go
@@ -152,6 +152,7 @@ func xParseColor(s string) color.Color {
 }
 
 func getMaxMin(a, b, c float64) (max, min float64) {
+	// TODO: use go1.21 min/max functions
 	if a > b {
 		max = a
 		min = b