diff --git a/diary.md b/diary.md
index b966c90..fa1cd96 100644
--- a/diary.md
+++ b/diary.md
@@ -1,3 +1,6 @@
+## Mon 10 Mar 2025
+- Add `ci.yml`.
+
 ## Sun 09 Mar 2025
 - Optimise `permanent_data.py` with better batched uploading and asynchronous API calls.
 - Optimise `transient_data.py` with better batched uploading and asynchronous API calls.