diff --git a/c/todo.txt b/c/todo.txt
index bed63f8798..d97b3deac4 100644
--- a/c/todo.txt
+++ b/c/todo.txt
@@ -9,6 +9,7 @@ TOP OF LIST:
 !  4.2.0: lashed emit; also n.b. new/modified cookbook entries
 ! neaten-valgrind @ cookbook
 ! headerless csv (i/o) choices -> cookbook
+! quantiles example to cookbook
 * missing-timestamp check @ cookbook
 
 ! quoting-original task: doc-only, or some coding? 4.3.0 if so.