diff --git a/constants.scad b/constants.scad
index 3879bf3..4be92c3 100644
--- a/constants.scad
+++ b/constants.scad
@@ -10,7 +10,11 @@
 
 // Section: General Constants
 
-$slop = 0.20;  // The printer specific amount of slop in mm to print with to make parts fit exactly.  You may need to override this value for your printer.
+// Constant: $slop
+// Description:
+//   The printer specific amount of slop in mm to print with to make parts fit exactly.
+//   You may need to override this value for your printer.
+$slop = 0.20;