Update source/lac/petsc_matrix_base.cc

Co-authored-by: Wolfgang Bangerth <bangerth@colostate.edu>

diff --git a/source/lac/petsc_matrix_base.cc b/source/lac/petsc_matrix_base.cc
index c7363ba9c7aec9afb6a16064392836491e93ba02..c030022699494d60c6dfa7b33fce87bbab1aa769 100644 (file)
--- a/source/lac/petsc_matrix_base.cc
+++ b/source/lac/petsc_matrix_base.cc
@@ -93,7 +93,7 @@ namespace PETScWrappers
   MatrixBase::assign_petsc_matrix(Mat A)
   {
     AssertThrow(last_action == ::dealii::VectorOperation::unknown,
-                ExcMessage("Cannot assign a new Mat"));
+                ExcMessage("Cannot assign a new Mat."));
     PetscErrorCode ierr =
       PetscObjectReference(reinterpret_cast<PetscObject>(A));
     AssertThrow(ierr == 0, ExcPETScError(ierr));