diff --git a/Libraries/LibMedia/Audio/PlaybackStream.h b/Libraries/LibMedia/Audio/PlaybackStream.h
index 0419ed171f1..d84a253a0cf 100644
--- a/Libraries/LibMedia/Audio/PlaybackStream.h
+++ b/Libraries/LibMedia/Audio/PlaybackStream.h
@@ -34,8 +34,9 @@ public:
     //
     // The initial_output_state parameter determines whether it will begin playback immediately.
     //
-    // The AudioDataRequestCallback will be called when the Output needs more audio data to fill
-    // its buffers and continue playback.
+    // The AudioDataRequestCallback will be called when the Output needs more audio data to fill its buffers and
+    // continue playback. This callback will only be allowed to run on one thread at a time, to prevent any data
+    // race on the resource used by the callback.
     static ErrorOr<NonnullRefPtr<PlaybackStream>> create(OutputState initial_output_state, u32 sample_rate, u8 channels, u32 target_latency_ms, AudioDataRequestCallback&&);
 
     virtual ~PlaybackStream() = default;