// $Id$
// Version: $Name$
//
-// Copyright (C) 2004, 2005, 2006 by the deal.II authors
+// Copyright (C) 2004, 2005, 2006, 2007 by the deal.II authors
//
// This file is subject to QPL and may not be distributed
// without copyright and license information. Please refer
* classes in this hierarchy don't do a whole lot, except for providing a
* function that sets the preconditioner and certain parameters on the
* preconditioning context of the solver. These classes are basically here
- * only to allow a similar interface than already used for the deal.II solver
+ * only to allow a similar interface as already used for the deal.II solver
* and preconditioner classes.
*
+ * Note that the classes here only provide interfaces to the relevant
+ * functionality of PETSc. PETSc does not implement all preconditioners for
+ * all matrix types. In particular, some preconditioners are not going to work
+ * for parallel jobs, such as for example the ILU preconditioner.
+ *
* @ingroup PETScWrappers
* @author Wolfgang Bangerth, 2004
*/