diff --git a/docs/lib2x-sort.md b/docs/lib2x-sort.md
index 91a40c7d..7a138178 100644
--- a/docs/lib2x-sort.md
+++ b/docs/lib2x-sort.md
@@ -2,12 +2,14 @@
 
 Sorts the elements of a list in ascending order. The list is a list-of-list construct, such as `[[a0, a1, a2...], [b0, b1, b2,...], [c0, c1, c2,...],...]`. When sorting, the function looks only at one index position of each sublist. 
 
+From dotSCAD 2.3, when `by` is `"vt"`, it will sort points by zyx (from the last index to the first one).
+
 **Since:** 2.0
 
 ## Parameters
 
 - `lt` : The original list.
-- `by` : Can be `"x"`、`"y"`、`"z"`, or `"idx"` (Default).
+- `by` : Can be `"x"`、`"y"`、`"z"`, `"idx"` (Default) or `"vt"`. 
 - `idx` : When `by` is `"idx"`, the value of `idx` is used. The Default value is 0.
 
 ## Examples
@@ -27,6 +29,4 @@ Sorts the elements of a list in ascending order. The list is a list-of-list cons
     assert(
         [[0, 2, 0], [0, 5, 0], [0, 7, 0], [0, 9, 0], [0, 10, 0]] == 
         sort([[0, 10, 0], [0, 5, 0], [0, 7, 0], [0, 2, 0], [0, 9, 0]], by = "idx", idx = 1)
-    );
-
-
+    );
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