diff --git a/docs/images/lib3x-rotate_p-1.JPG b/docs/images/lib3x-ptf_rotate-1.JPG
similarity index 100%
rename from docs/images/lib3x-rotate_p-1.JPG
rename to docs/images/lib3x-ptf_rotate-1.JPG
diff --git a/docs/images/lib3x-rotate_p-2.JPG b/docs/images/lib3x-ptf_rotate-2.JPG
similarity index 100%
rename from docs/images/lib3x-rotate_p-2.JPG
rename to docs/images/lib3x-ptf_rotate-2.JPG
diff --git a/docs/images/lib3x-rotate_p-3.JPG b/docs/images/lib3x-ptf_rotate-3.JPG
similarity index 100%
rename from docs/images/lib3x-rotate_p-3.JPG
rename to docs/images/lib3x-ptf_rotate-3.JPG
diff --git a/docs/lib3x-ptf_rotate.md b/docs/lib3x-ptf_rotate.md
index ee71edf8..6784e8da 100644
--- a/docs/lib3x-ptf_rotate.md
+++ b/docs/lib3x-ptf_rotate.md
@@ -26,7 +26,7 @@ Rotates a point `a` degrees around the axis of the coordinate system or an arbit
 	           sphere(1);   
 	}  
 
-![ptf_rotate](images/lib3x-rotate_p-1.JPG)
+![ptf_rotate](images/lib3x-ptf_rotate-1.JPG)
 
     use <ptf/ptf_rotate.scad>;
 
@@ -48,7 +48,7 @@ Rotates a point `a` degrees around the axis of the coordinate system or an arbit
 	
 	%sphere(radius);
 
-![ptf_rotate](images/lib3x-rotate_p-2.JPG)
+![ptf_rotate](images/lib3x-ptf_rotate-2.JPG)
 
 	use <ptf/ptf_rotate.scad>;
 
@@ -66,4 +66,4 @@ Rotates a point `a` degrees around the axis of the coordinate system or an arbit
 			sphere(1);  
 	}
 	
-![ptf_rotate](images/lib3x-rotate_p-3.JPG)
\ No newline at end of file
+![ptf_rotate](images/lib3x-ptf_rotate-3.JPG)
\ No newline at end of file
diff --git a/docs/lib3x-rails2sections.md b/docs/lib3x-rails2sections.md
index ca9aec95..52675bd8 100644
--- a/docs/lib3x-rails2sections.md
+++ b/docs/lib3x-rails2sections.md
@@ -4,6 +4,8 @@ It returns all cross-sections described by rails. Combined with the `sweep` modu
 
 Rails should be indexed count-clockwisely.
 
+**Since:** 3.2
+
 ## Parameters
 
 - `rails` : A list of rails used to describe the surface of the model.
diff --git a/docs/lib3x-rotate_p.md b/docs/lib3x-rotate_p.md
deleted file mode 100644
index dfbd32f1..00000000
--- a/docs/lib3x-rotate_p.md
+++ /dev/null
@@ -1,82 +0,0 @@
-# rotate_p
-
-Rotates a point `a` degrees about the axis of the coordinate system or around an arbitrary axis. It behaves as the built-in `rotate` module
-
-## Parameters
-
-- `point` : A 3D point `[x, y, z]` or a 2D point `[x, y]`.
-- `a` : If it's `[deg_x, deg_y, deg_z]`, the rotation is applied in the order `x`, `y`, `z`. If it's `[deg_x, deg_y]`, the rotation is applied in the order `x`, `y`.  If it's`[deg_x]`, the rotation is only applied to the `x` axis. If it's an number, the rotation is only applied to the `z` axis or an arbitrary axis.
-- `v`: A vector allows you to set an arbitrary axis about which the object will be rotated. When `a` is an array, the `v` argument is ignored. **Since:** 1.1.
-
-## Examples
-    
-You can use the code below to create a line.
-
-    use <rotate_p.scad>;
-
-	hull() {
-	    sphere(1);
-	    rotate([0, -45, 45]) 
-	        translate([20, 0, 0]) 
-	            sphere(1);   
-	}  
-
-The following code has the same effect.
-
-    use <rotate_p.scad>;
-
-	point = [20, 0, 0];
-	a = [0, -45, 45];
-	
-	hull() {
-	    sphere(1);
-	    translate(rotate_p(point, a))    
-	       rotate(a)  
-	           sphere(1);   
-	}  
-
-![rotate_p](images/lib3x-rotate_p-1.JPG)
-
-The `rotate_p` function is useful in some situations. For example, you probably want to get all points on the path of a spiral around a sphere. 
-
-    use <rotate_p.scad>;
-
-	radius = 40;
-	step_angle = 10;
-	z_circles = 20;
-	
-	points = [for(a = [0:step_angle:90 * z_circles]) 
-	    rotate_p(
-	        [radius, 0, 0], 
-	        [0, -90 + 2 * a / z_circles, a]
-	    )
-	];
-	
-	// Once you get all points on the path, you can place anything at each point.
-	// I just place a sphere as a simple demonstration.
-	for(p = points) {
-	    translate(p) 
-	        sphere(1);
-	}
-	
-	%sphere(radius);
-
-![rotate_p](images/lib3x-rotate_p-2.JPG)
-
-	use <rotate_p.scad>;
-
-	v = [10, 10, 10];
-
-	hull() {
-		sphere(1);
-		translate(v)
-		sphere(1);   
-	}
-
-	p = [10, 10, 0];
-	for(i = [0:20:340]) {
-		translate(rotate_p(p, a = i, v = v)) 
-			sphere(1);  
-	}
-	
-![rotate_p](images/lib3x-rotate_p-3.JPG)
\ No newline at end of file
diff --git a/docs/lib3x-sweep.md b/docs/lib3x-sweep.md
index 33ce428f..53831fa2 100644
--- a/docs/lib3x-sweep.md
+++ b/docs/lib3x-sweep.md
@@ -40,7 +40,7 @@ The indexes of the above triangles is:
 
 ## Examples
 
-	use <rotate_p.scad>;
+	use <ptf/ptf_rotate.scad>;
 	use <sweep.scad>;
 
 	section1 = [
@@ -55,7 +55,7 @@ The indexes of the above triangles is:
 		for(i = [0:55]) 
 			[
 				for(p = section1)
-					let(pt = rotate_p(p, [90, 0, 10 * i]))
+					let(pt = ptf_rotate(p, [90, 0, 10 * i]))
 					[pt[0], pt[1] , pt[2] + i]
 			]
 	];
@@ -64,7 +64,7 @@ The indexes of the above triangles is:
 
 ![sweep](images/lib3x-sweep-7.JPG)
 
-	use <rotate_p.scad>;
+	use <ptf/ptf_rotate.scad>;
 	use <sweep.scad>;
 	
 	section1 = [
@@ -85,7 +85,7 @@ The indexes of the above triangles is:
 	    for(i = [0:55]) 
 	        [
 	            for(p = section1)
-	                let(pt = rotate_p(p, [90, 0, 10 * i]))
+	                let(pt = ptf_rotate(p, [90, 0, 10 * i]))
 	                [pt[0], pt[1] , pt[2] + i]
 	        ]
 	];
@@ -94,7 +94,7 @@ The indexes of the above triangles is:
 
 ![sweep](images/lib3x-sweep-8.JPG)
 
-	use <rotate_p.scad>;
+	use <ptf/ptf_rotate.scad>;
 	use <sweep.scad>;
 	
 	section1 = [
@@ -113,7 +113,7 @@ The indexes of the above triangles is:
 	    for(i = [0:55]) 
 	        [
 	            for(p = section1)
-	                let(pt = rotate_p(p, [90, 0, 10 * i]))
+	                let(pt = ptf_rotate(p, [90, 0, 10 * i]))
 	                [pt[0], pt[1] , pt[2] + i]
 	        ]
 	];