Add to documentation.

git-svn-id: https://svn.dealii.org/trunk@19397 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/base/include/base/utilities.h b/deal.II/base/include/base/utilities.h
index e6b2234e53e1046df6a9a8fcdfe69367f20f32af..e97cad96e1cf5492853f85f9f5db252e29291239 100644 (file)
--- a/deal.II/base/include/base/utilities.h
+++ b/deal.II/base/include/base/utilities.h
@@ -278,6 +278,11 @@ namespace Utilities
                                      * communicators over which they can
                                      * interact without interfering with each
                                      * other.
+                                     *
+                                     * When no longer needed, the
+                                     * communicator created here needs to
+                                     * be destroyed using
+                                     * <code>MPI_Comm_free</code>.
                                      */
     MPI_Comm duplicate_communicator (const MPI_Comm &mpi_communicator);