diff --git a/TODO.md b/TODO.md
index d67d2af..def2aae 100644
--- a/TODO.md
+++ b/TODO.md
@@ -36,7 +36,7 @@ Priority levels:
 - [x] Lazy-load profile images and concept art.
 - [ ] Update only affected table rows instead of rebuilding entire tables.
 - [ ] Add an LRU cache for audio and images and remove old entries automatically.
-- [ ] Revoke discarded object URLs with `URL.revokeObjectURL(objectUrl)`.
+- [x] Revoke discarded object URLs with `URL.revokeObjectURL(objectUrl)`; completed synthesized voice previews now release their Blob URLs when playback ends.
 - [x] Add low-memory mode using `navigator.deviceMemory` where available; shared worker pools cap at two tasks on devices reporting approximately 4 GB RAM or less.
 - [ ] Disable image preloading and reduce table/cache sizes on devices with approximately 4 GB RAM.