add TODO for multiple challenges

1 files changed, 2 insertions, 1 deletions

diff --git a/README.md b/README.md
index b2d1302..8faba4a 100644
--- a/README.md
+++ b/README.md
@@ -59,4 +59,5 @@ Limitation / TODO
 * The challenge is not updated. The file is accessible read only in
   initramfs, but we have no easy way to write it to persistant storage.
   So probably this is a design limitation...
-
+* It may be worth to have a challenge for every key, named with the
+  serial number.