diff --git a/shapes.scad b/shapes.scad
index cb4c6a6..dfd3af1 100644
--- a/shapes.scad
+++ b/shapes.scad
@@ -28,12 +28,13 @@
 //----------------------
 
 // size is a vector [w, h, d]
-module box(size) {
-  cube(size, true);
+module box(width, height, depth,) {
+  cube([width, height, depth,], true);
 }
 
 // size is a vector [w, h, d]
-module roundedBox(size, radius) {
+module roundedBox(width, height, depth, radius) {
+  size=[width, height, depth,]
   cube(size - [2*radius,0,0], true);
   cube(size - [0,2*radius,0], true);
   for (x = [radius-size[0]/2, -radius+size[0]/2],