diff --git a/src/experimental/note.md b/src/experimental/note.md
index 0b2cbde7..2512a7f2 100644
--- a/src/experimental/note.md
+++ b/src/experimental/note.md
@@ -5,6 +5,7 @@ to_do:
 dotSCAD 3.0 Dev
 
 - `function_grapher`: delete `slicing` parameter. Improve `"LINES"`、`"HULL_LINES"` performance.
+- `hull_polyline3d`: Rename the parameter `thickness` to `diameter`.
 - `util/sort`: `by` accepts a function literal.
 - `util/bsearch`: only supports `sorted` and `target` parameters. I view it as a new function.
 - `util/dedup`: add the `eq` parameter.