diff --git a/B-mass-model.md b/B-mass-model.md
index 63ad66c..9d01508 100644
--- a/B-mass-model.md
+++ b/B-mass-model.md
@@ -51,14 +51,13 @@ If you do not compile the RooDoubleCB before running the MassFit for the first t
 
 ### RooExpAndGauss compilation
 
+This will fail if you already sourced ROOT or python [described here](https://git.physi.uni-heidelberg.de/kopecna/EWP-BplusToKstMuMu-AngAna/wiki/Selection-code#setting-up-python3-and-pyroot). You might have to restart the enviroment (easiest is to log out and in)
+
 ```
 cd Code/Selection/RooFit/RooExpAndGauss/
 make 
 ```
 
-**TODO** try this out!
-
-
 ## Fit model description
 The fit is defined in the `massFit` function in  [[MassFit.cpp|MassFit.cpp]]. The user can decide