diff --git a/audio/error_ios.go b/audio/error_ios.go
index 5ed62334a..62b28d619 100644
--- a/audio/error_ios.go
+++ b/audio/error_ios.go
@@ -23,6 +23,10 @@ package audio
 // #import <UIKit/UIKit.h>
 //
 // static UIApplicationState applicationState() {
+//   // Actually this method should be called on the main thread,
+//   // but there is no way to do that in the current Ebitengine implementation.
+//   // dispatch_(a)sync causes a deadlock.
+//   // As this is for an invetigation of iOS errors, that's OK to leave this issue so far.
 //   return [[UIApplication sharedApplication] applicationState];
 // }
 import "C"