diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 2556f056de..c304291858 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -1036,6 +1036,7 @@ static int mov_write_dref_tag(AVIOContext *pb)
     avio_wb32(pb, 1); /* entry count */
 
     avio_wb32(pb, 0xc); /* size */
+    //FIXME add the alis and rsrc atom
     ffio_wfourcc(pb, "url ");
     avio_wb32(pb, 1); /* version & flags */