diff --git a/README.md b/README.md
index 8c583b2..5418453 100644
--- a/README.md
+++ b/README.md
@@ -308,6 +308,9 @@ serialize(new Map([['a', 1], ['b', 2]])) // -> 'Map([["a",1],["b",2]])'
 
 ### Functions
 
+```javascript
+serialize(function(){}) // -> '<FUNC[14,(function(){})]>'
+```