diff --git a/diary.md b/diary.md
index 6385f83..3e9547e 100644
--- a/diary.md
+++ b/diary.md
@@ -1,3 +1,6 @@
+## Tue 18 Mar 2025
+- Add report headings.
+
 ## Mon 17 Mar 2025
 - Add services heatmap.
 - Add `return_all_coordinates` lambda function + tests.