diff --git a/Selection-code.md b/Selection-code.md
index ad13ba8..e286293 100644
--- a/Selection-code.md
+++ b/Selection-code.md
@@ -1,5 +1,8 @@
 The selection code is a set of C++ scripts. First, the running of the code is introduced. Then, each part of the code is explained. The main file of the selection code is [[B2Kstmumu.cpp][B2Kstmumu]]. However, as the code required a lot of reruns and checks at different places, the main code execution became obsolete and the scripts are compiled and run in ROOT step by step. However, the file [[B2Kstmumu.pro][B2Kstmumu.pro]] can be used by the QtCreator IDE.
 
+**Note that despite the usual standard of functions to return 0 if everything went flawless, the code was started with returning 1 is everything was okay, 0 means and error!**
+
+
 ## Setting up ROOT
 **TODO**