diff --git a/readme.md b/readme.md
index b87bca7..07caf38 100644
--- a/readme.md
+++ b/readme.md
@@ -2627,6 +2627,7 @@ Face order is bottom, top, left, right, front, back.
 | Function | Description |
 |:--- |:--- |
 | `psu_face_transform(type, face)` | Returns a transformation matrix to get to the specified face |
+| `psu_size(type)` | Size |
 | `terminal_block_length(type, ways)` | Total length of terminal block |
 
 ### Modules
diff --git a/vitamins/psu.scad b/vitamins/psu.scad
index b2a8a37..1756877 100644
--- a/vitamins/psu.scad
+++ b/vitamins/psu.scad
@@ -44,6 +44,7 @@ function psu_name(type)              = type[1];     //! The part name
 function psu_length(type)            = type[2];     //! Length
 function psu_width(type)             = type[3];     //! Width
 function psu_height(type)            = type[4];     //! Height
+function psu_size(type)              = [psu_length(type), psu_width(type), psu_height(type)]; //! Size
 function psu_screw(type)             = type[5];     //! Screw type
 function psu_screw_hole_radius(type) = type[6];     //! Clearance hole for screw, bigger than normal on ATX
 function atx_psu(type)               = type[7];     //! True if an ATX style PSU