diff --git a/B-mass-model.md b/B-mass-model.md
index 9f9e235..abf5f85 100644
--- a/B-mass-model.md
+++ b/B-mass-model.md
@@ -92,6 +92,9 @@ The fixed/starting parameters are saved in [[ParamValues.cpp|ParamValues.cpp]].
 [[BackgroundType Class|BackgroundType-Class]]
 
 LinkDef.hpp
+
+**TODO** check whether it is really needed
+
 ```
 #ifdef __CINT__
 #pragma link C++ class SignalType+;