diff --git a/src/experimental/note.md b/src/experimental/note.md
new file mode 100644
index 00000000..46cf9f1f
--- /dev/null
+++ b/src/experimental/note.md
@@ -0,0 +1,14 @@
+- deprecate `polysections`, use `sweep`.
+- deprecate `trianglate`, use `tri_ear_clipping`.
+- `sort` supports a list of ints?
+- `px_union`, `px_intersection`, `px_difference`?
+- `bsearch` supports `by`, `idx`?
+- `bsearch` supports a list of ints?
+
+Preview
+
+- `sweep`
+- `util/has`
+- `util/dedup`
+- `util/bsearch` for a sorted lt by z, y, x
+- `util/sort` supports `by = "vt"`
\ No newline at end of file
diff --git a/src/experimental/note.txt b/src/experimental/note.txt
deleted file mode 100644
index 2b353fb2..00000000
--- a/src/experimental/note.txt
+++ /dev/null
@@ -1,12 +0,0 @@
-- deprecate polysections, use sweep.
-- deprecate trianglate, use tri_ear_clipping.
-- sort supports a list of ints?
-- px_union, px_intersection, px_difference?
-
-Preview
-
-- sweep
-- util/has
-- util/dedup
-- util/bsearch for a sorted lt by z, y, x
-- util/sort supports by = "vt"
\ No newline at end of file