diff --git a/app/calculator.py b/app/calculator.py
index 8a976b257..c9f3318c7 100644
--- a/app/calculator.py
+++ b/app/calculator.py
@@ -13,3 +13,6 @@ def divide(x, y):
         if y == 0:
             return 'Cannot divide by 0'
         return x * 1.0 / y
+
+    def smile():
+        return ':))'