diff --git a/todo.txt b/todo.txt
index 84c2816..69fbf14 100644
--- a/todo.txt
+++ b/todo.txt
@@ -1,4 +1,5 @@
 TODO
+in models, strings and pointers do not have to be boost::optional
 preserve rpc error codes, just throwing runtime_error now
 monero_wallet.cpp move utilities in monero_namespace to be private
 polish model: remove all boost::optional from model to be consistent with core?