enhance SparseMatrix documentation

git-svn-id: https://svn.dealii.org/trunk@31165 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/include/deal.II/lac/sparsity_pattern.h b/deal.II/include/deal.II/lac/sparsity_pattern.h
index ada6bbf528afb5021496fed09a18f8066f155d35..532162f06b32d41013f9b629e8a89cf98e08b828 100644 (file)
--- a/deal.II/include/deal.II/lac/sparsity_pattern.h
+++ b/deal.II/include/deal.II/lac/sparsity_pattern.h
@@ -335,7 +335,8 @@ namespace SparsityPatternIterators
  * the elements of a row of a SparsityPattern with the help of iterators into
  * this object (using SparsityPattern::begin and SparsityPattern::end) you
  * will find that the elements are not sorted by column index within each row
- * whenever the matrix is square.
+ * whenever the matrix is square (the first item will be the diagonal, followed
+ * by the other entries sorted by column index).
  *
  * @note While this class forms the basis upon which SparseMatrix
  * objects base their storage format, and thus plays a central role in