add reference to step-16b

diff --git a/examples/step-16/doc/intro.dox b/examples/step-16/doc/intro.dox
index 85145b1051c84f4cebeec720e66e84a115d116e3..47bd8d1cfc14de227386c8358818775e04a451d2 100644 (file)
--- a/examples/step-16/doc/intro.dox
+++ b/examples/step-16/doc/intro.dox
@@ -1,5 +1,10 @@
 <br>
 
+<i> Note: A variant called step-16b of this tutorial exists, that uses
+MeshWorker and LocalIntegrators instead of assembling matrices manually as it
+is done in this tutorial.
+</i>
+
 <a name="Intro"></a>
 <h1>Introduction</h1>