1 files changed, 1 insertions, 0 deletions
diff --git a/ToDo b/ToDo
index fa60ea0128..c144100529 100644
--- a/ToDo
+++ b/ToDo
@@ -74,6 +74,7 @@ Standard Libraries
 * or raise ForkException to every thread but fork caller.
 * Hash::new{default} or recommend Hash#fetch?
 * new user-defined marshal scheme. _dump(dumper), _load(restorer)
+* warn, warning for Ruby level
 
 Extension Libraries