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+++ b/README.md
@@ -75,6 +75,7 @@ Too many dependencies? Because OpenSCAD doesn't provide namespace management, I
 	- [path_extrude](https://openhome.cc/eGossip/OpenSCAD/lib-path_extrude.html)
 	- [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)
 	
 - Other
     - [turtle2d](https://openhome.cc/eGossip/OpenSCAD/lib-turtle2d.html)
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+# golden_spiral_extrude
+
+Extrudes a 2D shape along the path of a golden 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: `circle_path`, `rotate_p`, `golden_spiral.scad`, `cross_sections`, `polysections`.
+
+## Parameters
+
+- `shape_pts` : A list of points represent a shape. See the example below.
+- `from` : The nth Fibonacci number you wanna start from.
+- `to` : The nth Fibonacci number you wanna go to.
+- `point_distance` : Distance between two points on the path.
+- `rt_dir` : `"CT_CLK"` for counterclockwise. `"CLK"` for clockwise. The default value is `"CT_CLK"`.
+- `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 <circle_path.scad>;
+	include <rotate_p.scad>;
+	include <golden_spiral.scad>;
+	include <cross_sections.scad>;
+	include <polysections.scad>;
+	include <golden_spiral_extrude.scad>;
+
+	shape_pts = [
+		[-2, -10],
+		[-2, 10],
+		[2, 10],
+		[2, -10]
+	];
+
+	golden_spiral_extrude(
+		shape_pts, 
+		from = 3, 
+		to = 10, 
+		point_distance = 1,
+		rt_dir = "CLK",
+		twist = 180,
+		scale = 0.1
+	);
+
+![golden_spiral_extrude](images/lib-golden_spiral_extrude-1.JPG)
+