diff --git a/doc/todo/docker_todo_list.mdwn b/doc/todo/docker_todo_list.mdwn
index 1321445..72ded42 100644
--- a/doc/todo/docker_todo_list.mdwn
+++ b/doc/todo/docker_todo_list.mdwn
@@ -1,3 +1,5 @@
 * There is no way for a property of a docker container to require
   some property be met outside the container. For example, some servers
   need ntp installed for a good date source.
+* The SimpleSh was added before `docker exec` existed, and could probably
+  be eliminated by using that.