diff --git a/README.md b/README.md
index bdb8e52..634534a 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
 # hello-bithug
 
 first commit from clientA
+
+second line added by clientB
diff --git a/src/app.py b/src/app.py
new file mode 100644
index 0000000..cf0af92
--- /dev/null
+++ b/src/app.py
@@ -0,0 +1 @@
+print('hello from bithug')