diff --git a/maintenance.md b/maintenance.md
index 3f6f1f9..38dd4b5 100644
--- a/maintenance.md
+++ b/maintenance.md
@@ -24,3 +24,4 @@ Newest entries at the bottom.
 - 2026-09-16: Coffee machine descaled.
 - 2026-09-16: Antenna realigned.
 - 2026-09-17: Cabin pressure sensors tested.
+- 2026-09-18: Radiation shielding inspected.