diff --git a/maintenance.md b/maintenance.md
index ddb730f..e7af1b2 100644
--- a/maintenance.md
+++ b/maintenance.md
@@ -26,3 +26,4 @@ Newest entries at the bottom.
 - 2026-09-17: Cabin pressure sensors tested.
 - 2026-09-18: Radiation shielding inspected.
 - 2026-09-18: Debugging duck accounted for.
+- 2026-09-18: Fire extinguishers checked.