diff --git a/src/rounded_cylinder.scad b/src/rounded_cylinder.scad
index 5f32450f..7f95548f 100644
--- a/src/rounded_cylinder.scad
+++ b/src/rounded_cylinder.scad
@@ -31,6 +31,11 @@ module rounded_cylinder(radius, h, round_r, convexity = 2, center = false) {
             rotate_extrude(convexity = convexity) 
                 polygon(shape_pts);
 
-    
+    // hook for testing
+    test_center_half_trapezium(center_pt, shape_pts);
 }
 
+// override it to test
+module test_center_half_trapezium(center_pt, shape_pts) {
+    
+}