Use proper grammar.

diff --git a/include/deal.II/lac/petsc_vector_base.h b/include/deal.II/lac/petsc_vector_base.h
index fb794d5027f42d8e4f62a9a62821d56822fd8ea1..296e757ce9ecf15e62e0f5c93d08eacf70221e8e 100644 (file)
--- a/include/deal.II/lac/petsc_vector_base.h
+++ b/include/deal.II/lac/petsc_vector_base.h
@@ -280,7 +280,7 @@ namespace PETScWrappers
     operator=(const VectorBase &) = delete;
 
     /**
-     * Destructor
+     * Destructor.
      */
     virtual ~VectorBase() override;