diff --git a/learning/05-functions/greeting.py b/learning/05-functions/greeting.py
new file mode 100644
index 0000000..c6d77fc
--- /dev/null
+++ b/learning/05-functions/greeting.py
@@ -0,0 +1,4 @@
+def add(a, b=10):
+    return a + b
+print(add(5, 3))
+print(add(5))
\ No newline at end of file