diff --git a/todo.txt b/todo.txt
index 5d09ed7103..4dc4e17f2e 100755
--- a/todo.txt
+++ b/todo.txt
@@ -1,4 +1,5 @@
 - clean up the tests!
+- GC: marker procs for native Nimrod GC and Boehm GC
 - thread support: threadvar on Windows seems broken; 
   add --deadlock_prevention:on|off switch
 - built-in serialization