diff --git a/todo.txt b/todo.txt
index 51967244..ab9db577 100644
--- a/todo.txt
+++ b/todo.txt
@@ -7,7 +7,7 @@ Report Cygwin linker memory issues
 handle more arguments
 MI from both ExtensionClasses and Python classes, or at least don't crash(!)
 Remove one level of indirection on type objects (no vtbl?).
-Make multiple inheritance from real Python classes work - I don't think this is possible
+Make multiple inheritance from real Python classes work
 Handle polymorphism (passing a Wrapped<Derived> as a Base*).
 Specializations of Caller<> for commmon combinations of argument types (?)
 special member functions for numeric types
@@ -16,6 +16,9 @@ testing with Python 2.0
 Make abstract classes non-instantiable (?)
 Much more testing, especially of things in objects.h
 Support for Python LONG types in Objects.h
+Concept checking for to_python<T>() template function
+Support for __del__()
+Reference-counting for UniquePodSet?
 
 Documentation:
     building
@@ -24,12 +27,6 @@ Documentation:
 
     special member functions
 
-    exposing data members as attributes
-        def_readonly()
-        def_readwrite()
-        def_getter()
-        def_setter()
-
     differences between Python classes and ExtensionClasses
         additional capabilities of ExtensionClasses
         slice adjustment