Update examples/step-15/step-15.cc

Co-authored-by: Martin Kronbichler <martin.kronbichler@rub.de>

diff --git a/examples/step-15/step-15.cc b/examples/step-15/step-15.cc
index a42ba2abc7e1071728d3f8ed302de24c1866897b..013dc483f31ac46a8ff6531634fb039b8890c4fa 100644 (file)
--- a/examples/step-15/step-15.cc
+++ b/examples/step-15/step-15.cc
@@ -209,7 +209,7 @@ namespace Step15
   // of course, the matrix and right hand side functions depend on the
   // previous iteration's solution. As discussed in the introduction, we need
   // to use zero boundary values for the Newton updates; this is done by using
-  // the `zero_constraint` object when assembling into the global matrix and
+  // the `zero_constraints` object when assembling into the global matrix and
   // vector.
   //
   // The top of the function contains the usual boilerplate code, setting up