diff --git a/paths.scad b/paths.scad
index 654a4271..d01bc8f7 100644
--- a/paths.scad
+++ b/paths.scad
@@ -1167,7 +1167,7 @@ function _sum_preserving_round(data, index=0) =
 
 // Function: subdivide_path()
 // Usage:
-//   newpath = subdivide_path(path, N, method);
+//   newpath = subdivifde_path(path, [N|refine], method);
 // Description:
 //   Takes a path as input (closed or open) and subdivides the path to produce a more
 //   finely sampled path.  The new points can be distributed proportional to length
@@ -1220,9 +1220,11 @@ function _sum_preserving_round(data, index=0) =
 // Example(FlatSpin): Three-dimensional paths also work
 //   mypath = subdivide_path([[0,0,0],[2,0,1],[2,3,2]], 12);
 //   move_copies(mypath)sphere(r=.1,$fn=32);
-function subdivide_path(path, N, closed=true, exact=true, method="length") =
+function subdivide_path(path, N, refine, closed=true, exact=true, method="length") =
     assert(is_path(path))
     assert(method=="length" || method=="segment")
+    assert(num_defined([N,refine]),"Must give exactly one of N and refine")
+    let(N = first_defined([N,len(path)*refine]))
     assert((is_num(N) && N>0) || is_vector(N),"Parameter N to subdivide_path must be postive number or vector")
     let(
         count = len(path) - (closed?0:1), 
diff --git a/rounding.scad b/rounding.scad
index 91551167..ed1f3ecf 100644
--- a/rounding.scad
+++ b/rounding.scad
@@ -94,10 +94,11 @@ include <structs.scad>
 //   verbose = if true display rounding scale factors that show how close roundovers are to overlapping.  Default: false
 //
 // Example(Med2D): Standard circular roundover with radius the same at every point. Compare results at the different corners.
-//   $fn=36;
-//   shape = [[0,0], [10,0], [15,12], [6,6], [6, 12], [-3,7]];
-//   polygon(round_corners(shape, radius=1));
-//   color("red") down(.1) polygon(shape);
+include<BOSL2/std.scad>
+   $fn=36;
+   shape = [[0,0], [10,0], [15,12], [6,6], [6, 12], [-3,7]];
+   polygon(round_corners(shape, radius=1));
+   color("red") down(.1) polygon(shape);
 // Example(Med2D): Circular roundover using the "cut" specification, the same at every corner.
 //   $fn=36;
 //   shape = [[0,0], [10,0], [15,12], [6,6], [6, 12], [-3,7]];