diff --git a/src/surface/sf_thickenT.scad b/src/surface/sf_thickenT.scad
index 35a2d342..9872fe6c 100644
--- a/src/surface/sf_thickenT.scad
+++ b/src/surface/sf_thickenT.scad
@@ -136,4 +136,29 @@ pts = [for(p = points) [p[0], p[1], rands(100, 120, 1)[0]]];
 thickness = 5;
 
 sf_thickenT(pts, thickness);
+*/
+
+/*
+use <surface/sf_thickenT.scad>;
+
+radius = 100;
+width = 2;
+thickness = .2;
+
+a_step = 10;
+r_step = 0.2;
+
+function f(x, y) = (pow(y,2)/pow(2, 2))-(pow(x,2)/pow(2, 2));
+
+points = [
+    for(a = [a_step:a_step:360])
+	    for(r = [r_step:r_step:2])
+		let(
+		    x = round(r * cos(a) * 100) / 100, 
+			y = round(r * sin(a) * 100) / 100
+		)
+		[x, y, f(x, y)] 
+];
+
+sf_thickenT(points, thickness, direction = [0, 0, 1]);
 */
\ No newline at end of file