diff --git a/marchenko/demo/WS15/README.2 b/marchenko/demo/WS15/README.2
index cd50a79d3c076b8c7da2aac13700544d3451cbc1..a3d6436cba1247097fab8f1239bfe59777ebb7e5 100644
--- a/marchenko/demo/WS15/README.2
+++ b/marchenko/demo/WS15/README.2
@@ -7,7 +7,11 @@ cd /lus/scratch/$USER/OpenSource/marchenko/demo/twoD
 cp -rp /lus/scratch/jan/OpenSource/marchenko/demo/twoD/shots .
 cp /lus/scratch/$USER/OpenSource/marchenko/demo/WS15/job.pbs .
 
-Adapt job.pbs to 
+Interactively run a progam to create the numerical model used to compute the reference reults.
+
+./model.scr
+
+When that is completed continue by adapting job.pbs to 
 
 Compute the intial focusing operator placed at a depth of 1100 m by running