diff --git a/TODO b/TODO
index 032264a661e8f57f2efaa1b02cf5ffbe536184a4..050c5c901b1d8e56b3a648dba31d01f8eae8de98 100644
--- a/TODO
+++ b/TODO
@@ -22,6 +22,7 @@
 
 TODO for NPTool:
 ----------------
+   + Change map's index of scorers to deal a typical case of dE-E for 2 plastics.
    + Build a dummy detector as a simple example of how NPTool is working
    + Add documentation
    + Add a dedicated class to deal with materials (see example from G4 tutorial)