diff --git a/readme.md b/readme.md
index 96b460b..f806491 100644
--- a/readme.md
+++ b/readme.md
@@ -5970,6 +5970,7 @@ Simple tube or ring
 ### Modules
 | Module | Description |
 |:--- |:--- |
+| `rectangular_tube(size, center = true, thickness = 1, fillet = 0.5)` | Create a retangular tube with filleted corners |
 | `ring(or, ir)` | Create a ring with specified external and internal radii |
 | `tube(or, ir, h, center = true)` | Create a tube with specified external and internal radii and height `h` |
 | `woven_tube(or, ir, h, center= true, colour = grey(30)` | Create a woven tube with specified external and internal radii, height `h`, colours, warp and weft |
diff --git a/tests/png/tube.png b/tests/png/tube.png
index 6ace38d..9749a8c 100644
Binary files a/tests/png/tube.png and b/tests/png/tube.png differ
diff --git a/utils/tube.scad b/utils/tube.scad
index de0ee71..b362d77 100644
--- a/utils/tube.scad
+++ b/utils/tube.scad
@@ -69,7 +69,7 @@ module woven_tube(or, ir, h, center= true, colour = grey(30), colour2, warp = 2,
     }
 }
 
-module rectangular_tube(size, center = true, thickness = 1, fillet = 0.5) {
+module rectangular_tube(size, center = true, thickness = 1, fillet = 0.5) { //! Create a retangular tube with filleted corners
     extrude_if(size.z, center = center)
         difference() {
             rounded_square([size.x, size.y], fillet);