diff --git a/src/engine/song.h b/src/engine/song.h
index 75e5a03e9..009b40980 100644
--- a/src/engine/song.h
+++ b/src/engine/song.h
@@ -263,8 +263,15 @@ struct DivSong {
   String name, author;
 
   // legacy song information
+  // those will be stored in .fur and mapped to VGM as:
+  // category -> game name
+  // writer -> ripper
+  // createdDate -> year
   String carrier, composer, vendor, category, writer, arranger, copyright, manGroup, manInfo, createdDate, revisionDate;
 
+  // more VGM specific stuff
+  String nameJ, authorJ, categoryJ;
+
   // other things
   String chanName[DIV_MAX_CHANS];
   String chanShortName[DIV_MAX_CHANS];