diff --git a/README.md b/README.md
index ea6a4a8..bb8e83e 100644
--- a/README.md
+++ b/README.md
@@ -3,3 +3,5 @@ test repository for diff utility testing
 
 this repository is being used by blamed diff tests for logical validations. any change in this repository may result
 in test errors
+
+# bla bla
\ No newline at end of file
diff --git a/src/test/simple_calculator.py b/src/test/simple_calculator.py
index 4693ad3..d3dbc89 100644
--- a/src/test/simple_calculator.py
+++ b/src/test/simple_calculator.py
@@ -1,2 +1,3 @@
+# this is calculator
 def add(a, b):
     return a + b