diff --git a/CM2005 Object Oriented Programming/Topic 1/1.7.1/main.cpp b/CM2005 Object Oriented Programming/Topic 1/1.7.1/main.cpp
index ecdd45d..5474ae9 100644
--- a/CM2005 Object Oriented Programming/Topic 1/1.7.1/main.cpp	
+++ b/CM2005 Object Oriented Programming/Topic 1/1.7.1/main.cpp	
@@ -23,4 +23,7 @@ int main()
   int c = difference(10, 7);
   std::cout << c << std::endl;
   return 0;
-}
\ No newline at end of file
+}
+
+//This can be compiled adding both files as in
+//g++ main.cpp side.cpp
\ No newline at end of file