diff --git a/public/SoundEmitterSystem/isoundemittersystembase.h b/public/SoundEmitterSystem/isoundemittersystembase.h
index 46bd4b2b..db9b4bf1 100644
--- a/public/SoundEmitterSystem/isoundemittersystembase.h
+++ b/public/SoundEmitterSystem/isoundemittersystembase.h
@@ -25,6 +25,7 @@
 typedef short HSOUNDSCRIPTHANDLE;
 #define SOUNDEMITTER_INVALID_HANDLE	(HSOUNDSCRIPTHANDLE)-1
 
+class IFileList;
 
 //-----------------------------------------------------------------------------
 // Purpose: 
@@ -253,13 +254,15 @@ public:
 
 	// Called from both client and server (single player) or just one (server only in dedicated server and client only if connected to a remote server)
 	// Called by LevelInitPreEntity to override sound scripts for the mod with level specific overrides based on custom mapnames, etc.
-	virtual void			AddSoundOverrides( char const *scriptfile ) = 0;
+	virtual void			AddSoundOverrides( char const *scriptfile, bool bUnknown ) = 0;
 
 	// Called by either client or server in LevelShutdown to clear out custom overrides
 	virtual void			ClearSoundOverrides() = 0;
 
 	virtual bool			GetParametersForSoundEx( const char *soundname, HSOUNDSCRIPTHANDLE& handle, CSoundParameters& params, gender_t gender, bool isbeingemitted = false ) = 0;
 	virtual soundlevel_t	LookupSoundLevelByHandle( char const *soundname, HSOUNDSCRIPTHANDLE& handle ) = 0;
+
+	virtual void			ReloadSoundEntriesInList( IFileList *pFileList ) = 0;
 };
 
 #endif // ISOUNDEMITTERSYSTEMBASE_H