diff --git a/todo.txt b/todo.txt
index cf3e353..6fe340f 100644
--- a/todo.txt
+++ b/todo.txt
@@ -1,3 +1,4 @@
 - onHeader, etc callbacks for Matroska
 - https://github.com/Vanilagy/mp4-muxer/issues/83 tell him it's possible now
-- is this fixed? https://github.com/Vanilagy/webm-muxer/issues/50
\ No newline at end of file
+- is this fixed? https://github.com/Vanilagy/webm-muxer/issues/50
+- decode and flush abstract in custom coders
\ No newline at end of file