diff --git a/TODO.md b/TODO.md
index b9ec479..7ff27a8 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,5 +1,9 @@
 # TODOs
 
+## HDD power status
+
+Log if HDD is active/idle or spun-down.
+
 ## Public IP address logging
 
 Logg the public IP address. Reuse `netcup-dns` Python functions.