diff --git a/geometry.scad b/geometry.scad
index 507393f..a32ea24 100644
--- a/geometry.scad
+++ b/geometry.scad
@@ -1386,7 +1386,9 @@ function polygon_area(poly, signed=false) =
 //   If you provide a non-planar or collinear polygon you will get an error.  For self-intersecting
 //   polygons you may get an error or you may get meaningless results.
 //   .
-//   If object is a manifold VNF then returns the 3d centroid of the polyhedron.  The VNF must
+//   Given a [[region|regions.scad]], returns the 2D coordinates of the region's centroid.
+//   .
+//   Given a manifold [[VNF|vnf.scad]] then returns the 3D centroid of the polyhedron.  The VNF must
 //   describe a valid polyhedron with consistent face direction and no holes in the mesh; otherwise
 //   the results are undefined.
 // Arguments:
diff --git a/paths.scad b/paths.scad
index 1d68f97..9af7a71 100644
--- a/paths.scad
+++ b/paths.scad
@@ -1142,7 +1142,7 @@ function _assemble_a_path_from_fragments(fragments, rightmost=true, startfrag=0,
 ///   fragments = List of paths to be assembled into complete polygons.
 ///   eps = The epsilon error value to determine whether two points coincide.  Default: `EPSILON` (1e-9)
 function _assemble_path_fragments(fragments, eps=EPSILON, _finished=[]) =
-   len(fragments)==0? _finished :
+    len(fragments)==0? _finished :
     let(
         minxidx = min_index([
             for (frag=fragments) min(column(frag,0))