Fix a grammar error.

diff --git a/include/deal.II/multigrid/mg_transfer_global_coarsening.h b/include/deal.II/multigrid/mg_transfer_global_coarsening.h
index 8820af597bb115657971400d5bd56ef7ad22278c..49a0f8ccefddfdd9cc79b3038ee038d11124ad4d 100644 (file)
--- a/include/deal.II/multigrid/mg_transfer_global_coarsening.h
+++ b/include/deal.II/multigrid/mg_transfer_global_coarsening.h
@@ -392,7 +392,7 @@ public:
 
 protected:
   /**
-   * Internal vector on that the actual prolongation/restriction is performed.
+   * Internal vector on which the actual prolongation/restriction is performed.
    */
   mutable LinearAlgebra::distributed::Vector<Number> vec_coarse;