Fix typo

diff --git a/examples/step-12/step-12.cc b/examples/step-12/step-12.cc
index c7564a3681c5a75fb47dac2828ccd7ae6e6115e9..3df36e8819a4257c6209600da10569a4e31a8b3a 100644 (file)
--- a/examples/step-12/step-12.cc
+++ b/examples/step-12/step-12.cc
@@ -142,7 +142,7 @@ namespace Step12
   //
   // After this preparations, we proceed with the main class of this program,
   // called AdvectionProblem. It is basically the main class of step-6. We do
-  // not have a AffineConstraints object, because there are no hanging node
+  // not have an AffineConstraints object, because there are no hanging node
   // constraints in DG discretizations.
 
   // Major differences will only come up in the implementation of the assemble