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@@ -1392,11 +1392,12 @@ added: v10.0.0
 * Returns: {boolean}
 
 Returns `true` if the value is a native `External` value.
-A native `External` value is a special type of object whose
-data is not stored within the JavaScript managed heap
-and does not conform to standard JavaScript types. Such
-objects are created either by Node.js internals or native
-addons and are wrapped by a JavaScript object.
+
+A native `External` value is a special type of object that contains a
+raw C++ pointer (`void*`) for access from native code, and has no other
+properties. Such objects are created either by Node.js internals or native
+addons. In JavaScript, they are [frozen][`Object.freeze()`] objects with a
+`null` prototype.
 
 ### `util.types.isFloat32Array(value)`
 <!-- YAML
@@ -2319,6 +2320,7 @@ util.log('Timestamped message.');
 [`Int8Array`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Int8Array
 [`Map`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map
 [`Object.assign()`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
+[`Object.freeze()`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze
 [`Promise`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise
 [`Proxy`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy
 [`Set`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set