diff --git a/README.md b/README.md
index 5777cbc88..b47ab9fce 100644
--- a/README.md
+++ b/README.md
@@ -946,7 +946,7 @@ const getType = v =>
 Use `Array.isArray()` to check if a value is classified as an array.
 
 ```js
-const isArray = val => val && Array.isArray(val);
+const isArray = val => !!val && Array.isArray(val);
 // isArray(null) -> false
 // isArray([1]) -> true
 ```