Mention ExternalLibraries/MPI as source for MPI support

git-svn-id: http://svn.cactuscode.org/flesh/trunk@4920 17b73243-c579-4c4c-a9d2-2d5706c11dac

1 files changed, 4 insertions, 3 deletions

diff --git a/doc/UsersGuide/Notes.tex b/doc/UsersGuide/Notes.tex
index 8bb56fb2..ed369cd1 100644
--- a/doc/UsersGuide/Notes.tex
+++ b/doc/UsersGuide/Notes.tex
@@ -52,15 +52,16 @@ in single processor mode. Please refer to the architecture section
 
 \noindent
 To use Cactus, with the default driver\footnote{For help with unfamiliar terms, please consult the glossary, Appendix \ref{sec:glossary}.} (\texttt{CactusPUGH/PUGH}) on multiple
-processors you also need:
+processors you also need to include the thorn \texttt{ExternalLibraries/MPI}
+in your thornlist, to include support for
 \begin{Lentry}
 \item[MPI] The \textit{Message Passing Interface},
 which provides inter-processor communication.
 Supercomputing sites often supply a native MPI implementation
 that is very likely to be compatible with Cactus. Otherwise, there are
-various freely available ones available, e.g. the MPICH
+various freely available ones available, e.g. the OpenMPI
 version of MPI is available for various architectures and operating
-systems at \url{http://www-unix.mcs.anl.gov/mpi/}.
+systems at \url{http://www.open-mpi.org/}.
 \end{Lentry}
 
 \noindent