Add one.
diff --git a/TODO.md b/TODO.md
index ace1bc2..246a05c 100644
--- a/TODO.md
+++ b/TODO.md
@@ -21,6 +21,7 @@
 
 ## Features
 
+* add flag `ZIP_FL_SUPPORT_MULTIPLE_OPENS` and allow zip_fopen (perhaps other functions) on added/replaced files with such sources
 * add seek support for AES-encrypted files
 * consistently use `_zip_crypto_clear()` for passwords
 * support setting extra fields from `zip_source`