diff --git a/unnecessarymath.py b/unnecessarymath.py
index 0985cd871a346cb459146b9089777029fa28bd11..71d4ad67992d7a7a98c261f5e7d053d2b4eea0b9 100644
--- a/unnecessarymath.py
+++ b/unnecessarymath.py
@@ -20,6 +20,6 @@ def square(x):
     >>> square(2)
     4
     >>> square(4.)
-    16.
+    16.0
     """
     return x * x