Add a TODO
diff --git a/TODO.md b/TODO.md
index 76c2449..a7305aa 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,3 +1,7 @@
+## Before next release
+
+reconsider zip_source_zip (uncompressed data for whole file not easy to get)
+
 ## Prefixes
 
 For example for adding extractors for self-extracting zip archives.