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-Takes a binary STL file as input and generates a SVG that contains the
-triangles "folded flat" so that they can be laser cut.
+![Unfolded sphere](https://farm8.staticflickr.com/7464/15880804609_88b0865685_z.jpg)
 
-Work in progress -- not yet feature complete.
+`unfold` reads a binary STL file on standard input and generates a
+SVG that contains the triangles "folded flat" so that they can be
+laser cut.  It will output multiple groups in the SVG file that
+will need to be re-arranged to fit on the laser cutter bed.
+
+More info: https://trmm.net/Unfolding_STL
+
+This is a work in progress -- it is not yet feature complete.
+Among the features that it could use:
+
+* A better heuristic for finding the maximum non-overlaping set of triangles
+(Currently breadth-first search is used, with a slight preference for coplanar
+triangles)
+
+* Tabs for securing parts together.
+
+* Collapsing of very small or very thin triangles.
+
+* Marking mountain or valley folds.