diff --git a/gridbeam.scad b/gridbeam.scad
old mode 100755
new mode 100644
index 43007a6679c29fc295f863bdf8418b8a604035e0..33b7f6bf49df4914da44d6cdeb8a645642c12525
--- a/gridbeam.scad
+++ b/gridbeam.scad
@@ -7,6 +7,7 @@
 
 /* Todo:
  - implement "dxf" mode
+ - implement hole cutout pattern - interference based on hole size, compatible with two sizes above and below the currently set size.
 */
 
 // zBeam(segments) - create a vertical gridbeam strut 'segments' long