diff --git a/marchenko/demo/WS15/README.2 b/marchenko/demo/WS15/README.2
index c51bcb744dd24f4e14d9109e47eba9db114031af..fa4b28fc55974907c239351736d1368bdf4172ed 100644
--- a/marchenko/demo/WS15/README.2
+++ b/marchenko/demo/WS15/README.2
@@ -17,5 +17,12 @@ and run the marchenko program
  
 marchenko.scr
 
+Compare the Green's function computed by marchenko with the reference (adapt job.pbs to run referenceShot.scr)
+
+You can experiment with 
+-number of iterations, 
+-intial focusing position, 
+-investigate at intermediate results (see ../oneD/marchenkoIter.scr as an example).
+
 
 
diff --git a/marchenko/demo/WS15/README.3 b/marchenko/demo/WS15/README.3
new file mode 100644
index 0000000000000000000000000000000000000000..37f0f302e0cc317af54a956bd8f75e61d3262c83
--- /dev/null
+++ b/marchenko/demo/WS15/README.3
@@ -0,0 +1 @@
+plane waves
diff --git a/marchenko/demo/WS15/README.4 b/marchenko/demo/WS15/README.4
new file mode 100644
index 0000000000000000000000000000000000000000..b6da83df289fa2f49cabe03af2abe301a4403847
--- /dev/null
+++ b/marchenko/demo/WS15/README.4
@@ -0,0 +1,3 @@
+
+ 
+Primaries only