diff --git a/doc/api/fs.md b/doc/api/fs.md
index dee32e8696a7c2..34320bcf1fdafa 100644
--- a/doc/api/fs.md
+++ b/doc/api/fs.md
@@ -1198,6 +1198,7 @@ changes:
   * `start` {integer}
   * `end` {integer}
   * `highWaterMark` {integer}
+* Returns: {ReadStream}
 
 Returns a new [`ReadStream`][] object. (See [Readable Streams][]).
 
@@ -1273,6 +1274,7 @@ changes:
   * `mode` {integer}
   * `autoClose` {boolean}
   * `start` {integer}
+* Returns: {WriteStream}
 
 Returns a new [`WriteStream`][] object. (See [Writable Stream][]).
 
@@ -1428,6 +1430,7 @@ changes:
 -->
 
 * `path` {string|Buffer|URL}
+* Returns: {boolean}
 
 Synchronous version of [`fs.exists()`][].
 Returns `true` if the path exists, `false` otherwise.
@@ -1546,6 +1549,7 @@ added: v0.1.95
 -->
 
 * `fd` {integer}
+* Returns: {fs.Stats}
 
 Synchronous fstat(2). Returns an instance of [`fs.Stats`][].
 
@@ -1820,6 +1824,7 @@ changes:
 -->
 
 * `path` {string|Buffer|URL}
+* Returns: {fs.Stats}
 
 Synchronous lstat(2). Returns an instance of [`fs.Stats`][].
 
@@ -1945,6 +1950,7 @@ added: v5.10.0
 * `prefix` {string}
 * `options` {string|Object}
   * `encoding` {string} **Default:** `'utf8'`
+* Returns: {string}
 
 The synchronous version of [`fs.mkdtemp()`][]. Returns the created
 folder path.
@@ -2069,6 +2075,7 @@ changes:
 * `path` {string|Buffer|URL}
 * `flags` {string|number}
 * `mode` {integer} **Default:** `0o666`
+* Returns: {number}
 
 Synchronous version of [`fs.open()`][]. Returns an integer representing the file
 descriptor.
@@ -2159,6 +2166,7 @@ changes:
 * `path` {string|Buffer|URL}
 * `options` {string|Object}
   * `encoding` {string} **Default:** `'utf8'`
+* Returns: {Array} An array of filenames
 
 Synchronous readdir(3). Returns an array of filenames excluding `'.'` and
 `'..'`.
@@ -2260,6 +2268,7 @@ changes:
 * `options` {Object|string}
   * `encoding` {string|null} **Default:** `null`
   * `flag` {string} **Default:** `'r'`
+* Returns: {string|Buffer}
 
 Synchronous version of [`fs.readFile()`][]. Returns the contents of the `path`.
 
@@ -2320,6 +2329,7 @@ changes:
 * `path` {string|Buffer|URL}
 * `options` {string|Object}
   * `encoding` {string} **Default:** `'utf8'`
+* Returns: {string|Buffer}
 
 Synchronous readlink(2). Returns the symbolic link's string value.
 
@@ -2342,6 +2352,7 @@ changes:
 * `offset` {integer}
 * `length` {integer}
 * `position` {integer}
+* Returns: {number}
 
 Synchronous version of [`fs.read()`][]. Returns the number of `bytesRead`.
 
@@ -2452,6 +2463,7 @@ changes:
 * `path` {string|Buffer|URL}
 * `options` {string|Object}
   * `encoding` {string} **Default:** `'utf8'`
+* Returns: {string|Buffer}
 
 Synchronously computes the canonical pathname by resolving `.`, `..` and
 symbolic links.
@@ -2482,6 +2494,7 @@ added: v9.2.0
 * `path` {string|Buffer|URL}
 * `options` {string|Object}
   * `encoding` {string} **Default:** `'utf8'`
+* Returns: {string|Buffer}
 
 Synchronous realpath(3).
 
@@ -2619,6 +2632,7 @@ changes:
 -->
 
 * `path` {string|Buffer|URL}
+* Returns: {fs.Stats}
 
 Synchronous stat(2). Returns an instance of [`fs.Stats`][].
 
@@ -3197,6 +3211,7 @@ changes:
 * `offset` {integer}
 * `length` {integer}
 * `position` {integer}
+* Returns: {number}
 
 ## fs.writeSync(fd, string[, position[, encoding]])
 <!-- YAML
@@ -3211,6 +3226,7 @@ changes:
 * `string` {string}
 * `position` {integer}
 * `encoding` {string}
+* Returns: {number}
 
 Synchronous versions of [`fs.write()`][]. Returns the number of bytes written.
 
diff --git a/doc/api/util.md b/doc/api/util.md
index 7475e36f1c2013..976621ddb383e3 100644
--- a/doc/api/util.md
+++ b/doc/api/util.md
@@ -190,6 +190,7 @@ contains circular references.
   Similar to `util.inspect()` without options.
   This will show the full object not including non-enumerable symbols and properties.
 * `%%` - single percent sign (`'%'`). This does not consume an argument.
+* Returns: {string} The formatted string
 
 If the placeholder does not have a corresponding argument, the placeholder is
 not replaced.
@@ -491,7 +492,7 @@ added: v9.0.0
 * `val2` {any}
 * Returns: {boolean}
 
-Returns `true` if there is deep strict equality between `val` and `val2`.
+Returns `true` if there is deep strict equality between `val1` and `val2`.
 Otherwise, returns `false`.
 
 See [`assert.deepStrictEqual()`][] for more information about deep strict
@@ -806,6 +807,7 @@ deprecated: v4.0.0
 > Stability: 0 - Deprecated
 
 * `object` {any}
+* Returns: {boolean}
 
 Internal alias for [`Array.isArray`][].
 
@@ -831,6 +833,7 @@ deprecated: v4.0.0
 > Stability: 0 - Deprecated
 
 * `object` {any}
+* Returns: {boolean}
 
 Returns `true` if the given `object` is a `Boolean`. Otherwise, returns `false`.
 
@@ -854,6 +857,7 @@ deprecated: v4.0.0
 > Stability: 0 - Deprecated: Use [`Buffer.isBuffer()`][] instead.
 
 * `object` {any}
+* Returns: {boolean}
 
 Returns `true` if the given `object` is a `Buffer`. Otherwise, returns `false`.
 
@@ -877,6 +881,7 @@ deprecated: v4.0.0
 > Stability: 0 - Deprecated
 
 * `object` {any}
+* Returns: {boolean}
 
 Returns `true` if the given `object` is a `Date`. Otherwise, returns `false`.
 
@@ -900,6 +905,7 @@ deprecated: v4.0.0
 > Stability: 0 - Deprecated
 
 * `object` {any}
+* Returns: {boolean}
 
 Returns `true` if the given `object` is an [`Error`][]. Otherwise, returns
 `false`.
@@ -939,6 +945,7 @@ deprecated: v4.0.0
 > Stability: 0 - Deprecated
 
 * `object` {any}
+* Returns: {boolean}
 
 Returns `true` if the given `object` is a `Function`. Otherwise, returns
 `false`.
@@ -966,6 +973,7 @@ deprecated: v4.0.0
 > Stability: 0 - Deprecated
 
 * `object` {any}
+* Returns: {boolean}
 
 Returns `true` if the given `object` is strictly `null`. Otherwise, returns
 `false`.
@@ -990,6 +998,7 @@ deprecated: v4.0.0
 > Stability: 0 - Deprecated
 
 * `object` {any}
+* Returns: {boolean}
 
 Returns `true` if the given `object` is `null` or `undefined`. Otherwise,
 returns `false`.
@@ -1014,6 +1023,7 @@ deprecated: v4.0.0
 > Stability: 0 - Deprecated
 
 * `object` {any}
+* Returns: {boolean}
 
 Returns `true` if the given `object` is a `Number`. Otherwise, returns `false`.
 
@@ -1039,6 +1049,7 @@ deprecated: v4.0.0
 > Stability: 0 - Deprecated
 
 * `object` {any}
+* Returns: {boolean}
 
 Returns `true` if the given `object` is strictly an `Object` **and** not a
 `Function`. Otherwise, returns `false`.
@@ -1065,6 +1076,7 @@ deprecated: v4.0.0
 > Stability: 0 - Deprecated
 
 * `object` {any}
+* Returns: {boolean}
 
 Returns `true` if the given `object` is a primitive type. Otherwise, returns
 `false`.
@@ -1101,6 +1113,7 @@ deprecated: v4.0.0
 > Stability: 0 - Deprecated
 
 * `object` {any}
+* Returns: {boolean}
 
 Returns `true` if the given `object` is a `RegExp`. Otherwise, returns `false`.
 
@@ -1124,6 +1137,7 @@ deprecated: v4.0.0
 > Stability: 0 - Deprecated
 
 * `object` {any}
+* Returns: {boolean}
 
 Returns `true` if the given `object` is a `string`. Otherwise, returns `false`.
 
@@ -1149,6 +1163,7 @@ deprecated: v4.0.0
 > Stability: 0 - Deprecated
 
 * `object` {any}
+* Returns: {boolean}
 
 Returns `true` if the given `object` is a `Symbol`. Otherwise, returns `false`.
 
@@ -1172,6 +1187,7 @@ deprecated: v4.0.0
 > Stability: 0 - Deprecated
 
 * `object` {any}
+* Returns: {boolean}
 
 Returns `true` if the given `object` is `undefined`. Otherwise, returns `false`.