diff --git a/src/experimental/note.md b/src/experimental/note.md
index df66b0d4..3c049ab5 100644
--- a/src/experimental/note.md
+++ b/src/experimental/note.md
@@ -1 +1,4 @@
+to_do:
+
 - deprecate `trianglate`, use `tri_ear_clipping`.
+- t2d_L_system?
\ No newline at end of file