diff --git a/20251230120816.todo.md b/20251230120816.todo.md
index e0b8049..8811fc7 100644
--- a/20251230120816.todo.md
+++ b/20251230120816.todo.md
@@ -3,7 +3,7 @@
 ## Tasks
 
 - [ ] Fix side hose adaptor
-- [ ] Backdoor lock- replace batteries
+- [x] Backdoor lock- replace batteries
 - [x] replace gas bottle
 - [x] Level nature strip - section 8 
 - [x] clean air con filters