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@@ -76,6 +76,7 @@ Too many dependencies? Because OpenSCAD doesn't provide namespace management, I
 	- [ring_extrude](https://openhome.cc/eGossip/OpenSCAD/lib-ring_extrude.html)
 	- [helix_extrude](https://openhome.cc/eGossip/OpenSCAD/lib-helix_extrude.html)
 	- [golden_spiral_extrude](https://openhome.cc/eGossip/OpenSCAD/lib-golden_spiral_extrude.html)
+	- [archimedean_spiral_extrude](https://openhome.cc/eGossip/OpenSCAD/lib-archimedean_spiral_extrude.html)
 	
 - Other
     - [turtle2d](https://openhome.cc/eGossip/OpenSCAD/lib-turtle2d.html)
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+# archimedean_spiral_extrude
+
+Extrudes a 2D shape along the path of an archimedean spiral. 
+
+When using this module, you should use points to represent the 2D shape. You need to provide indexes of triangles, too. This module provides two prepared triangles indexes. One is `"RADIAL"`. See [polysections](https://openhome.cc/eGossip/OpenSCAD/lib-polysections.html) for details.
+
+Dependencies: `rotate_p`, `archimedean_spiral`, `cross_sections`, `polysections`.
+
+## Parameters
+
+- `shape_pts` : A list of points represent a shape. See the example below.
+- `arm_distance`, `init_angle`, `point_distance`, `num_of_points` and `rt_dir` : See [archimedean_spiral](https://openhome.cc/eGossip/OpenSCAD/lib-archimedean_spiral.html) for details.
+- `twist` : The number of degrees of through which the shape is extruded.
+- `scale` : Scales the 2D shape by this value over the length of the extrusion. Scale can be a scalar or a vector.
+- `triangles` : `"RADIAL"` (default), `"HOLLOW"` or user-defined indexes. See [polysections](https://openhome.cc/eGossip/OpenSCAD/lib-polysections.html) for details.
+
+## Examples
+    
+	include <archimedean_spiral.scad>;
+	include <rotate_p.scad>;
+	include <cross_sections.scad>;
+	include <polysections.scad>;
+	include <archimedean_spiral_extrude.scad>;
+
+
+	shape_pts = [
+		[-5, 0], [-5, 4],
+		[-4, 4], [-4, 2],
+		[4, 2], [4, 4],
+		[5, 4], [5, 0]
+	];
+
+	archimedean_spiral_extrude(
+		shape_pts,
+		arm_distance = 15,  
+		init_angle = 180, 
+		point_distance = 5,
+		num_of_points = 100,
+		scale = [1, 5],
+		triangles = [
+			[0, 1, 2],
+			[0, 2, 3],
+			[0, 3, 4],
+			[0, 4, 7],
+			[4, 5, 6],
+			[4, 6, 7]
+		]
+	);
+
+![archimedean_spiral_extrude](images/lib-archimedean_spiral_extrude-1.JPG)
+