More explanation.

git-svn-id: http://svn.cactuscode.org/arrangements/CactusNumerical/Norms/trunk@4 f4913095-0e4f-0410-abea-a123d184f1f3

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@@ -11,10 +11,16 @@ Purpose of the thorn:
 
 Compute norms of the state vector, e.g. for Mexico tests.  These are
 special norms that make a difference between variables which have a
-second derivative taken and variables which have not; see gr-qc
-0503056.
+second derivative taken and variables which have not; see
+gr-qc/0503056.  These norms include the gradients of those variables
+that have a second derivative taken.  In doing so, they take all
+wavelenghts into account -- in contrast, a norm that would be based
+simply on using centered differences to calculate gradients would not.
 
 
 
-gr-qc 0503056: Calabrese, Hinder, Husa: Numerical stability for finite
-difference approximations of Einstein's equations
+References:
+
+Gioel Calabrese, Ian Hinder, Sascha Husa: Numerical stability for
+finite difference approximations of Einstein's equations,
+gr-qc/0503056 (2005)