diff --git a/common/yacreader_global_gui.h b/common/yacreader_global_gui.h
index 46680c35..6c3f6ac5 100644
--- a/common/yacreader_global_gui.h
+++ b/common/yacreader_global_gui.h
@@ -92,6 +92,11 @@ static const QString YACReaderLibrarSubReadingListMimeDataFormat = "application/
 	//Text=0x05
  };
 
+ enum LibraryUITheme
+ {
+     Light,
+     Dark
+ };
 
 void addSperator(QWidget * w);
 QAction * createSeparator();