diff --git a/src/experimental/note.md b/src/experimental/note.md
index 8b7303c1..66be6bd2 100644
--- a/src/experimental/note.md
+++ b/src/experimental/note.md
@@ -19,4 +19,5 @@ New modules/functions
 - `util/every`
 - `util/some`
 
+- delete `m_cumulate`
 - delete `trianglate`, use `tri_ear_clipping`?