diff --git a/Printed-Parts/scad/x-end.scad b/Printed-Parts/scad/x-end.scad
index e201d34..513d181 100755
--- a/Printed-Parts/scad/x-end.scad
+++ b/Printed-Parts/scad/x-end.scad
@@ -7,7 +7,9 @@
 
 use <bearing.scad>
 use <polyholes.scad>
-rod_distance = 45;
+
+// Parameters 
+rod_distance = 45; // Distance between vertical rods
 
 module x_end_base(){
 // Main block