diff --git a/diary.md b/diary.md
index e985a95..fa2989b 100644
--- a/diary.md
+++ b/diary.md
@@ -1,3 +1,7 @@
+## Sat 01 Mar 2025
+- Add GSI to permanent_data table to allow efficient querying of objects by type.
+  - Sped up querying IrishRailStations from approx 10s to 1s (10x improvement!).
+
 ## Fri 28 Feb 2025
 - Update newest_data API to accept objectType arguments.
   - Add test script to test this.