Extend documentation

diff --git a/include/deal.II/lac/la_parallel_vector.h b/include/deal.II/lac/la_parallel_vector.h
index 2841949469106601b3842afb03903c87d5728f54..5db98f861fcbd83d45853488cfb36da33e676c2c 100644 (file)
--- a/include/deal.II/lac/la_parallel_vector.h
+++ b/include/deal.II/lac/la_parallel_vector.h
@@ -515,6 +515,9 @@ namespace LinearAlgebra
        * warning to prevent this situation.
        *
        * Must follow a call to the @p compress_start function.
+       *
+       * When the MemorySpace is CUDA and MPI is not CUDA-aware, data changed on
+       * the device after the call to compress_start will be lost.
        */
       void
       compress_finish(::dealii::VectorOperation::values operation);