diff --git a/maintenance.md b/maintenance.md
index 4b06653..ae4898a 100644
--- a/maintenance.md
+++ b/maintenance.md
@@ -29,3 +29,4 @@ Newest entries at the bottom.
 - 2026-09-18: Fire extinguishers checked.
 - 2026-09-20: Fire extinguishers checked.
 - 2026-09-20: Oxygen scrubbers replaced.
+- 2026-09-21: Solar panels cleaned.