diff --git a/todo b/todo
index 3ea4e30..e574c33 100644
--- a/todo
+++ b/todo
@@ -5,3 +5,7 @@
 * Investigate using UMONITOR/UMWAIT for spinlocks to reduce busy-waiting
   stress/power consumption. Look for a parallel on ARM.
 * Investigate WFE/SEV to reduce busy-waiting in spinlocks on ARM.
+* The input arg `requiredLocks` to LockSet::LockSet() should be
+  a ref and not by-value. Propagate this upward into
+  SerializedAsyncContin and into all derived classes'
+  constructors.