diff --git a/readme.md b/readme.md
index 8871430..641783a 100644
--- a/readme.md
+++ b/readme.md
@@ -2707,6 +2707,7 @@ Linear rails with carriages.
 | Function | Description |
 |:--- |:--- |
 | ```carriage_screw_depth(type)``` | Carriage thread depth |
+| ```carriage_size(type)``` | Size of carriage |
 | ```rail_holes(type, length)``` | Number of holes in a rail given its ```length``` |
 | ```rail_screw_height(type, screw)``` | Position screw taking into account countersink into counterbored hole |
 | ```rail_travel(type, length)``` | How far the carriage can travel |