diff --git a/B-mass-model.md b/B-mass-model.md
index eecf139..5414af7 100644
--- a/B-mass-model.md
+++ b/B-mass-model.md
@@ -1,6 +1,8 @@
 The B mass fit is performed by the functions defined in [[MassFit.cpp|MassFit.cpp]]. 
 
 
+
+
 [[BackgroundPdf Class|BackgroundPdf-Class]]
 
 [[BackgroundType Class|BackgroundType-Class]]
@@ -21,3 +23,19 @@ LinkDef.hpp
 [[SignalPdf Class|SignalPdf-Class]]
 
 [[SignalType Class|SignalType-Class]]
+
+
+
+## Mass Fit compilation
+ Recompile mass fit
+
+```
+ .L BmassShape/SignalType.cpp+
+ .L BmassShape/SignalPdf.cpp+
+ .L BmassShape/BackgroundType.cpp+
+ .L BmassShape/BackgroundPdf.cpp+
+ .L BmassShape/ParamValues.cpp+
+ .L MassFit.cpp+
+```
+ 
+ 
\ No newline at end of file