diff --git a/docs/lib3x-vx_contour.md b/docs/lib3x-vx_contour.md
index 8dbc4300..e3f7343e 100644
--- a/docs/lib3x-vx_contour.md
+++ b/docs/lib3x-vx_contour.md
@@ -7,7 +7,6 @@ Given a list of points that form a closed area, `vx_contour` returns the contour
 ## Parameters
 
 - `points` : A list of `[x, y]` points.
-- `sorted` : Default to `false`. If your points is sorted by x y, setting it to `true` will accelerate the calculation speed.
 
 ## Examples