diff --git a/TODO b/TODO
index 346fc83d..6434a619 100644
--- a/TODO
+++ b/TODO
@@ -5,6 +5,9 @@ This is the list of TODO items for SnapRAID.
 
 - Next
 
+* When using the -d option, ensure that the specified disk name really
+exists.
+
 * Detect files moved from one disk to another. We won't be able to reuse
 parity, but we can reuse the hash to check that the file was moved
 correctly.