diff --git a/crates/chanora_audio/src/ios_voice_unit.rs b/crates/chanora_audio/src/ios_voice_unit.rs
index e9e0554..6f707a7 100644
--- a/crates/chanora_audio/src/ios_voice_unit.rs
+++ b/crates/chanora_audio/src/ios_voice_unit.rs
@@ -1060,6 +1060,9 @@ impl IosVoiceUnit {
                 callbacks_with_audio = callbacks_with_audio.wrapping_add(1);
             } else {
                 callbacks_with_silence = callbacks_with_silence.wrapping_add(1);
+                // Muted output writes intentional silence (peak_i16 == 0 by
+                // design), not a starved render path. Gate on !muted to avoid
+                // counting deliberate silence as an output underrun.
                 if !muted {
                     audio_processing_stats_for_render.increment_output_underrun();
                 }