Small clarification with option.

manual/manual.tex

@@ -583,8 +583,8 @@ Set the environment variable \texttt{OMP\_NUM\_THREADS} to a value that works fo
     \item[--frame=\emph{int}] first frame for PNG output (-1=do not set)
     \item[--numframe=\emph{int}] number of frames to output to PNG images (default=1,-1=all)
     \item[--size=\emph{int}] width and height of PNG in pixels (default=512)
-    \item[--compSurf=\emph{[[+]file]}] compute and write boundary surfaces to \lit{file}. If \lit{file} is not
-        specified, use the model name. Specify \lit{+} to NOT exit after writing file. 
+    \item[--compSurf=\emph{[+][file]}] compute and write boundary surfaces to \lit{file}. If \lit{file} is not
+        specified, use the model name. Specify \lit{+} to NOT exit immediately after writing file. 
         To not write a file, specify \lit{file} as \lit{/dev/null}.
 \end{description}