diff --git a/marchenko/demo/oneD/backpropf2.scr b/marchenko/demo/oneD/backpropf2.scr
index 0dc1ea8e92769151b27ed1d4b8d719a965e0f8ad..2041570cce37829889067b1a50a72277402c7c5f 100755
--- a/marchenko/demo/oneD/backpropf2.scr
+++ b/marchenko/demo/oneD/backpropf2.scr
@@ -26,6 +26,7 @@ basop choice=shift shift=$shift file_in=nep.su verbose=1 > pplus.su
 #ftr1d file_in=pplus.su file_out=freq.su
 #sushw < freq.su key=nhs,dt a=8192,500 > fr.su
 #ftr1d file_in=fr.su n1=8194 file_out=pplusdt.su verbose=1
+#this is now done within the fdelmodc code: 
 
 #backpropagate f2.su and collect snapshots
 fdelmodc \