document another gotcha in using PUGH with CoordBase

git-svn-id: http://svn.cactuscode.org/arrangements/CactusBase/CoordBase/trunk@24 0337457d-221f-4ee6-a5f0-14255d5370d8

1 files changed, 21 insertions, 6 deletions

diff --git a/doc/documentation.tex b/doc/documentation.tex
index 49ef96f..42e576d 100644
--- a/doc/documentation.tex
+++ b/doc/documentation.tex
@@ -610,12 +610,27 @@ When using the CoordBase domain and boundary parameters, the driver
 
 \subsection{PUGH}
 
-If you're using PUGH, you \textbf{must} still set the parameters
-\verb|driver::global_nx|, \verb|driver::global_ny|, and
-\verb|driver::global_nz| by hand.  (Of course, you must set them
-to values consistent with the CoordBase parameters.)  (If you don't
-set these parameters, PUGH will assume a default $10 \times 10 \times 10$
-grid, which is almost certainly not what you want!)
+If you're using PUGH, you \textbf{must} still explicitly set the
+parameters
+\begin{verbatim}
+driver::global_nx
+driver::global_ny
+driver::global_nz
+\end{verbatim}
+(Of course, you must set these to values consistent with the CoordBase
+parameters!)  (If you don't set these parameters, PUGH will assume a
+default $10 \times 10 \times 10$ grid, which is almost certainly not
+what you want!)
+
+You may also need to explicitly set the parameters
+\begin{verbatim}
+driver::ghost_size_x
+driver::ghost_size_y
+driver::ghost_size_z
+\end{verbatim}
+(again to values consistent with the CoordBase parameters!).  If you
+don't set these parameters, PUGH will assume a default of $1$ for
+each of them, which may not be what you want.
 
 \subsection{Carpet}