diff --git a/internal/audio/generator.go b/internal/audio/generator.go
index ab55283..74bfbaa 100644
--- a/internal/audio/generator.go
+++ b/internal/audio/generator.go
@@ -39,6 +39,9 @@ func NewSineGenerator(
 		return nil, fmt.Errorf("base frequency must be finite and greater than zero, got %g", baseFrequency)
 	}
 
+	// Keep every generated tone below the Nyquist frequency (the
+	// Kotelnikov–Nyquist–Shannon sampling limit), sampleRate/2
+	// Nyquist leaved as compromise for common English terminology
 	sampleRate := float64(rate.Num) / float64(rate.Den)
 	highestFrequency := float64(cfg.Channels()) * baseFrequency
 	nyquist := sampleRate / 2