diff --git a/TODO.txt b/TODO.txt
index f69e94d55..a5faea145 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -2,6 +2,8 @@
 BEAST TODO
 --------------------------------------------------------------------------------
 
+- Design a WeakPtr / SharedPtr / SharedObject intrusive system
+
 - Implement beast::Bimap?
 
 - Use Bimap for storage in the DeadlineTimer::Manager, to support