From 489cdf8d97f0259a2ab7c5ec0794bd7a42298bd8 Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Wed, 22 Jan 2020 16:51:37 -0700
Subject: [PATCH] Mention namespaces in step-20.

---
 examples/step-20/step-20.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/examples/step-20/step-20.cc b/examples/step-20/step-20.cc
index c1713c06e7..98d412490b 100644
--- a/examples/step-20/step-20.cc
+++ b/examples/step-20/step-20.cc
@@ -64,7 +64,8 @@
 // <code>TensorFunction</code> class that offers such functionality:
 #include <deal.II/base/tensor_function.h>
 
-// The last step is as in all previous programs:
+// The last step is as in all previous programs: We put all of the code relevant
+// to this program into a namespace. (This idea was first introduced in step-7.)
 namespace Step20
 {
   using namespace dealii;
-- 
2.39.5