diff --git a/skin.scad b/skin.scad
index 5888521..0a9afc3 100644
--- a/skin.scad
+++ b/skin.scad
@@ -1478,6 +1478,8 @@ module spiral_sweep(poly, h, r, turns=1, taper, r1, r2, d, d1, d2, internal=fals
 //   orient = Vector to rotate top towards after spin
 //   atype  = Select "hull" or "intersect" anchor types.  Default: "hull"
 //   cp = Centerpoint for determining "intersect" anchors or centering the shape.  Determintes the base of the anchor vector.  Can be "centroid", "mean", "box" or a 3D point.  Default: "centroid"
+// Side Effects:
+//   `$transforms` is set to the array of transformation matrices that define the swept object.  
 // Anchor Types:
 //   "hull" = Anchors to the virtual convex hull of the shape.
 //   "intersect" = Anchors to the surface of the shape.