diff --git a/todo b/todo
index a1d4580..756ce84 100644
--- a/todo
+++ b/todo
@@ -35,3 +35,5 @@
   * We can use asynchronous bridging to ensure that asynchronous
     events are executed in the meantime while we wait for the sync
     timeout to complete.
+* StimulusBuffer should take a sh_ptr<DeviceAttachmentSpec> and not
+  a DeviceAttachmentSpec&.