From 3d315f8d7c1d23c0538c6a01b5929815519f8690 Mon Sep 17 00:00:00 2001
From: Niclas Jansson <njansson@kth.se>
Date: Tue, 27 Aug 2019 09:58:30 +0200
Subject: [PATCH] Update instructions

---
 lab3/README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lab3/README.md b/lab3/README.md
index a467183..a5ad652 100644
--- a/lab3/README.md
+++ b/lab3/README.md
@@ -32,9 +32,9 @@ The simplest solution is likely to be for you to create a character buffer, and
 
 # Exercise 2 - MPI I/O and dervied types
 
-Take the serial stl reader and modify it such that the stl file is read and written in parallel using collective MPI I/O.
+Take the serial stl reader and modify it such that the stl file is read (and written) in parallel using collective MPI I/O. Use derived types such that the file can be read/written with a maximum of 3 I/O operations per read and write.
 
-The simplest solution is likely to create a derived type for each triangle, and then use the MPI_File_write_at_all function. A correct solution will have the same MD5 hash for both stl models (input and output)
+The simplest solution is likely to create a derived type for each triangle, and then use the MPI_File_XXXX_at_all function. A correct solution will have the same MD5 hash for both stl models (input and output), unless the order of the triangles has been changed.
 
 ```
 md5sum out.stl data/sphere.stl
-- 
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