Advertise NonlinearSolverSelector in step-77.

diff --git a/examples/step-77/doc/results.dox b/examples/step-77/doc/results.dox
index 8459cc9857067ae7c31de71c0b528ca48741b08c..88e1cb378ff0f1dd72a44dbe3c59d579a29953a6 100644 (file)
--- a/examples/step-77/doc/results.dox
+++ b/examples/step-77/doc/results.dox
@@ -656,3 +656,15 @@ happen, let us simply point out that the test suite program
 necessary to use NOX instead of KINSOL are quite minimal; in
 particular, NOX (unlike SNES) is happy to work with deal.II's own
 vector and matrix classes.
+
+
+<h4> Replacing SUNDIALS' KINSOL by a generic nonlinear solver </h4>
+
+Having to choose which of these three frameworks (KINSOL, SNES, or NOX)
+to use at compile time is cumbersome when wanting to compare things. It
+would be nicer if one could decide the package to use at run time, assuming that one
+has a copy of deal.II installed that is compiled against all three of these
+dependencies. It turns out that this is possible, using the class
+NonlinearSolverSelector that presents a common interface to all three of
+these solvers, along with the ability to choose which one to use based
+on run-time parameters.