diff --git a/docs/lib-hull_polyline3d.md b/docs/lib-hull_polyline3d.md
index 77008175..61a22a81 100644
--- a/docs/lib-hull_polyline3d.md
+++ b/docs/lib-hull_polyline3d.md
@@ -4,7 +4,7 @@ Creates a 3D polyline from a list of `[x, y, z]` coordinates. As the name says,
 
 ## Parameters
 
-- `points` : The list of `[x, y, z]` points of the polyline. : A vector of 3 element vectors. The points are indexed from 0 to n-1.
+- `points` : The list of `[x, y, z]` points of the polyline. The points are indexed from 0 to n-1.
 - `thickness` : The line thickness.
 - `$fa`, `$fs`, `$fn` : Check [the sphere module](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Primitive_Solids#sphere) for more details,.
 
diff --git a/docs/lib-polyline2d.md b/docs/lib-polyline2d.md
index aad205be..fe327f9d 100644
--- a/docs/lib-polyline2d.md
+++ b/docs/lib-polyline2d.md
@@ -5,7 +5,7 @@ Creates a polyline from a list of `x`, `y` coordinates. When the end points are
 
 ## Parameters
 
-- `points` : The list of `x`, `y` points of the polyline. : A vector of 2 element vectors. The points are indexed from 0 to n-1.
+- `points` : The list of `[x, y]` points of the polyline. The points are indexed from 0 to n-1.
 - `width` : The line width.
 - `startingStyle` : The end-cap style of the starting point. The value must be `"CAP_BUTT"`, `"CAP_SQUARE"` or `"CAP_ROUND"`. The default value is `"CAP_SQUARE"`. 
 - endingStyle : The end-cap style of the ending point. The value must be `"CAP_BUTT"`, `"CAP_SQUARE"` or `"CAP_ROUND"`. The default value is `"CAP_SQUARE"`. 
diff --git a/docs/lib-polyline3d.md b/docs/lib-polyline3d.md
index 5478b6a1..6f0b4387 100644
--- a/docs/lib-polyline3d.md
+++ b/docs/lib-polyline3d.md
@@ -4,7 +4,7 @@ Creates a polyline from a list of `[x, y, z]` coordinates. It depends on the `li
 
 ## Parameters
 
-- `points` : The list of `[x, y, z]` points of the polyline. : A vector of 3 element vectors. The points are indexed from 0 to n-1.
+- `points` : The list of `[x, y, z]` points of the polyline. The points are indexed from 0 to n-1.
 - `thickness` : The line thickness.
 - `startingStyle` : The end-cap style of the starting point. The value must be `"CAP_BUTT"`, `"CAP_CIRCLE"` or `"CAP_SPHERE"`. The default value is `"CAP_CIRCL"`. 
 - endingStyle : The end-cap style of the ending point. The value must be `"CAP_BUTT"`, `"CAP_CIRCLE"` or `"CAP_SPHERE"`. The default value is `"CAP_CIRCLE"`.