diff --git a/README.md b/README.md
index 640da6cd9..6dff38d61 100644
--- a/README.md
+++ b/README.md
@@ -153,7 +153,7 @@ Use `reduce()` to get all elements that are not arrays, flatten each element tha
 
 ```js
 const deepFlatten = arr =>
-  arr.reduce( (a, v) => a.concat( Array.isArray(v) ? flatten(v) : v ), []);
+  arr.reduce((a, v) => a.concat(Array.isArray(v) ? deepFlatten(v) : v), []);
 // deepFlatten([1,[2],[[3],4],5]) -> [1,2,3,4,5]
 ```