Augment the documentation of a member variable.

diff --git a/include/deal.II/base/mpi_consensus_algorithms.h b/include/deal.II/base/mpi_consensus_algorithms.h
index 814bc1610e5286036ce5b7b72599eef18c1c3ed6..62beefe7ef4af227ac988bdeba0190903291eece 100644 (file)
--- a/include/deal.II/base/mpi_consensus_algorithms.h
+++ b/include/deal.II/base/mpi_consensus_algorithms.h
@@ -329,7 +329,11 @@ namespace Utilities
         std::vector<MPI_Request> recv_requests;
 
         /**
-         * Buffers for sending answers to requests.
+         * Buffers for sending answers to requests. We use a vector of
+         * pointers because that guarantees that the buffers themselves
+         * are newer moved around in memory, even if the vector is
+         * resized and consequently its elements (the pointers) are moved
+         * around.
          */
         std::vector<std::unique_ptr<std::vector<T2>>> request_buffers;