diff --git a/FCNC-Fitter.md b/FCNC-Fitter.md
index e492d94..8e4b2ee 100644
--- a/FCNC-Fitter.md
+++ b/FCNC-Fitter.md
@@ -42,7 +42,7 @@ set(SPDLOG_INCLUDE_DIR_TWO "/yourPath/spdlog/include/spdlog/")
 
 
 ## File structure
-Currently, the file structure is as follows:
+Currently, the file structure is as follows. All the `.cc` source files also have their corresponding header with the same `name.hh`.
 
 * bu2kstarmumu.cc: The main
 * **sources**