Augment documentation.

git-svn-id: https://svn.dealii.org/trunk@31694 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/tests/bits/find_cell_10a.cc b/tests/bits/find_cell_10a.cc
index 4412b5932d7c16fe06a1f24d95c498e7513f7d46..b4888a15db9aecbad360fbb6b31e42e0f59807e0 100644 (file)
--- a/tests/bits/find_cell_10a.cc
+++ b/tests/bits/find_cell_10a.cc
@@ -17,6 +17,10 @@
 
 
 // transform_real_to_unit_cell works for MappingQ(1) but fails for MappingQ1.
+//
+// this is a case where a cell is extremely elongated, and just taking the l2
+// norm to measure progress in a Newton search is inadequate. we need to take a
+// variable norm that keeps the elongation of the cell in mind.
 
 #include "../tests.h"