From 8443f7fe715e0a6f44e87e0cb2f4bc10ff2dc3b6 Mon Sep 17 00:00:00 2001
From: Matthias Maier <tamiko@43-1.org>
Date: Mon, 11 Feb 2019 18:46:19 -0600
Subject: [PATCH] Address J.-P.'s comments

---
 examples/step-20/doc/intro.dox | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/examples/step-20/doc/intro.dox b/examples/step-20/doc/intro.dox
index 7a836f0edf..844507e93f 100644
--- a/examples/step-20/doc/intro.dox
+++ b/examples/step-20/doc/intro.dox
@@ -605,6 +605,10 @@ creating another solver and inverse:
     U = op_M_inv * (F - op_B * P);
 @endcode
 
+@note The functionality that we developed in this example step by hand is
+already readily available in the library. Have a look at
+schur_complement(), condense_schur_rhs(), and postprocess_schur_solution().
+
 
 <h4>A preconditioner for the Schur complement</h4>
 
-- 
2.39.5