diff --git a/generation/WinSDK/emitter.settings.rsp b/generation/WinSDK/emitter.settings.rsp
index 218491966..5ca43e8a0 100644
--- a/generation/WinSDK/emitter.settings.rsp
+++ b/generation/WinSDK/emitter.settings.rsp
@@ -1293,3 +1293,5 @@ SendMessageA::wParam=[-Optional]
 SendMessageA::lParam=[-Optional]
 NCryptOpenKey::dwLegacyKeySpec=[-Optional]
 MFPCreateMediaPlayer::creationOptions=[-Optional]
+DirectSoundCreate::pUnkOuter=[Optional]
+IDirectSound::CreateSoundBuffer::pUnkOuter=[Optional]
\ No newline at end of file
diff --git a/scripts/ChangesSinceLastRelease.txt b/scripts/ChangesSinceLastRelease.txt
index 40579398d..daa18f4c7 100644
--- a/scripts/ChangesSinceLastRelease.txt
+++ b/scripts/ChangesSinceLastRelease.txt
@@ -30,3 +30,6 @@ Windows.Win32.Globalization.Apis.LCMapStringEx : sortHandle : [In,Optional] => [
 Windows.Win32.Media.MediaFoundation.Apis.MFPCreateMediaPlayer : creationOptions : [In,Optional] => [In]
 Windows.Win32.UI.WindowsAndMessaging.Apis.SendMessageA : lParam : [Optional] => [In]
 Windows.Win32.UI.WindowsAndMessaging.Apis.SendMessageA : wParam : [Optional] => [In]
+# Fixed #508.
+Windows.Win32.Media.Audio.DirectSound.Apis.DirectSoundCreate : pUnkOuter : [In] => [Optional]
+Windows.Win32.Media.Audio.DirectSound.IDirectSound.CreateSoundBuffer : pUnkOuter : [In] => [Optional]