diff --git a/diary.md b/diary.md
index 2a4f382..b966c90 100644
--- a/diary.md
+++ b/diary.md
@@ -4,6 +4,7 @@
 - Add `test_permanent_data`.
 - Add `test_transient_data`.
 - Add tests for `return_all_data`.
+- Add tests for `return_newest_data`.
 
 ## Sat 08 Mar 2025
 - Make CSS more responsive for smaller screens.