diff --git a/README.md b/README.md
index ee07a577e..458bf5611 100644
--- a/README.md
+++ b/README.md
@@ -754,9 +754,10 @@ const uuid = _ =>
 
 Use `!isNaN` in combination with `parseFloat()` to check if the argument is a number.
 Use `isFinite()` to check if the number is finite.
+Use `Number()` to check if the coercion holds.
 
 ```js
-const validateNumber = n => !isNaN(parseFloat(n)) && isFinite(n);
+const validateNumber = n => !isNaN(parseFloat(n)) && isFinite(n) && Number(n) == n;
 // validateNumber('10') -> true
 ```