diff --git a/B-mass-model.md b/B-mass-model.md
index da1ebc3..e969bd0 100644
--- a/B-mass-model.md
+++ b/B-mass-model.md
@@ -2,7 +2,7 @@
 
 The B mass fit is performed by the functions defined in [[MassFit.cpp|MassFit.cpp]]. In this file, the main function `massFit` is defined. This function is rather complex with many parameters as we tried a lot of mass models. 
 
-The fit model is base on RooFit **TODO**
+The fit model is based on [RooFit](https://root.cern/manual/roofit/*).
 
 Before executing any part of the selection code involving the mass fit, it is needed to compile the files with the classes needed for the fit.