Add a TODO item.

diff --git a/doc/TODO b/doc/TODO
index e938843e540a434b8607001c3d25687fb96988a7..d2797675c48f882fc9f957eee168bb24c895313e 100644 (file)
--- a/doc/TODO
+++ b/doc/TODO
@@ -1,3 +1,6 @@
 * Update show definitions.
 
 * Document everything.
+
+* Test whether or not dropping the guards from the Tetrahedron.volume
+  function speeds things up (and still produces a correct result).