diff --git a/doc/api/util.md b/doc/api/util.md
index 47d685b0cac..03ef10ba1aa 100644
--- a/doc/api/util.md
+++ b/doc/api/util.md
@@ -940,12 +940,12 @@ added: v0.6.0
 deprecated: v4.0.0
 -->
 
-> Stability: 0 - Deprecated
+> Stability: 0 - Deprecated: Use [`Array.isArray()`][] instead.
 
 * `object` {any}
 * Returns: {boolean}
 
-Internal alias for [`Array.isArray`][].
+Alias for [`Array.isArray()`][].
 
 Returns `true` if the given `object` is an `Array`. Otherwise, returns `false`.
 
@@ -966,7 +966,7 @@ added: v0.11.5
 deprecated: v4.0.0
 -->
 
-> Stability: 0 - Deprecated
+> Stability: 0 - Deprecated: Use `typeof value === 'boolean'` instead.
 
 * `object` {any}
 * Returns: {boolean}
@@ -1078,7 +1078,7 @@ added: v0.11.5
 deprecated: v4.0.0
 -->
 
-> Stability: 0 - Deprecated
+> Stability: 0 - Deprecated: Use `typeof value === 'function'` instead.
 
 * `object` {any}
 * Returns: {boolean}
@@ -1106,7 +1106,7 @@ added: v0.11.5
 deprecated: v4.0.0
 -->
 
-> Stability: 0 - Deprecated
+> Stability: 0 - Deprecated: Use `value === null` instead.
 
 * `object` {any}
 * Returns: {boolean}
@@ -1131,7 +1131,8 @@ added: v0.11.5
 deprecated: v4.0.0
 -->
 
-> Stability: 0 - Deprecated
+> Stability: 0 - Deprecated: Use
+> `value === undefined || value === null` instead.
 
 * `object` {any}
 * Returns: {boolean}
@@ -1156,7 +1157,7 @@ added: v0.11.5
 deprecated: v4.0.0
 -->
 
-> Stability: 0 - Deprecated
+> Stability: 0 - Deprecated: Use `typeof value === 'number'` instead.
 
 * `object` {any}
 * Returns: {boolean}
@@ -1182,13 +1183,15 @@ added: v0.11.5
 deprecated: v4.0.0
 -->
 
-> Stability: 0 - Deprecated
+> Stability: 0 - Deprecated:
+> Use `value !== null && typeof value === 'object'` instead.
 
 * `object` {any}
 * Returns: {boolean}
 
 Returns `true` if the given `object` is strictly an `Object` **and** not a
-`Function`. Otherwise, returns `false`.
+`Function` (even though functions are objects in JavaScript).
+Otherwise, returns `false`.
 
 ```js
 const util = require('util');
@@ -1209,7 +1212,9 @@ added: v0.11.5
 deprecated: v4.0.0
 -->
 
-> Stability: 0 - Deprecated
+> Stability: 0 - Deprecated: Use
+> `(typeof value !== 'object' && typeof value !== 'function') || value === null`
+> instead.
 
 * `object` {any}
 * Returns: {boolean}
@@ -1270,7 +1275,7 @@ added: v0.11.5
 deprecated: v4.0.0
 -->
 
-> Stability: 0 - Deprecated
+> Stability: 0 - Deprecated: Use `typeof value === 'string'` instead.
 
 * `object` {any}
 * Returns: {boolean}
@@ -1296,7 +1301,7 @@ added: v0.11.5
 deprecated: v4.0.0
 -->
 
-> Stability: 0 - Deprecated
+> Stability: 0 - Deprecated: Use `typeof value === 'symbol'` instead.
 
 * `object` {any}
 * Returns: {boolean}
@@ -1320,7 +1325,7 @@ added: v0.11.5
 deprecated: v4.0.0
 -->
 
-> Stability: 0 - Deprecated
+> Stability: 0 - Deprecated: Use `value === undefined` instead.
 
 * `object` {any}
 * Returns: {boolean}
@@ -1379,7 +1384,7 @@ deprecated: v0.11.3
 Deprecated predecessor of `console.log`.
 
 [`'uncaughtException'`]: process.html#process_event_uncaughtexception
-[`Array.isArray`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/isArray
+[`Array.isArray()`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/isArray
 [`Buffer.isBuffer()`]: buffer.html#buffer_class_method_buffer_isbuffer_obj
 [`Error`]: errors.html#errors_class_error
 [`Object.assign()`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign