-This draws the three-dimensional variant of the recursive Sierpinski
-triangle fractal, using GL. Written by Tim Robinson and Jamie Zawinski.
+This draws the Sierpinski tetrahedron fractal, the three-dimensional
+variant of the recursive Sierpinski triangle.
+
+http://en.wikipedia.org/wiki/Sierpinski_triangle#Analogs_in_higher_dimension
+
+Written by Jamie Zawinski and Tim Robinson; 1999.