diff --git a/doc/api/util.md b/doc/api/util.md
index 0efa9461abe649..c9681d1c2b2ab7 100644
--- a/doc/api/util.md
+++ b/doc/api/util.md
@@ -332,6 +332,8 @@ Inherit the prototype methods from one [constructor][] into another. The
 prototype of `constructor` will be set to a new object created from
 `superConstructor`.
 
+This mainly adds some input validation on top of
+`Object.setPrototypeOf(constructor.prototype, superConstructor.prototype)`.
 As an additional convenience, `superConstructor` will be accessible
 through the `constructor.super_` property.