diff --git a/src/pocketmine/utils/Config.php b/src/pocketmine/utils/Config.php
index be7a5f601..373e15043 100644
--- a/src/pocketmine/utils/Config.php
+++ b/src/pocketmine/utils/Config.php
@@ -68,7 +68,7 @@ class Config{
 	public const ENUM = 5; // .txt, .list, .enum
 	public const ENUMERATION = Config::ENUM;
 
-	/** @var array */
+	/** @var mixed[] */
 	private $config = [];
 
 	/** @var mixed[] */
@@ -106,10 +106,10 @@ class Config{
 	];
 
 	/**
-	 * @param string $file    Path of the file to be loaded
-	 * @param int    $type    Config type to load, -1 by default (detect)
-	 * @param array  $default Array with the default values that will be written to the file if it did not exist
-	 * @param null   $correct reference parameter, Sets correct to true if everything has been loaded correctly
+	 * @param string  $file    Path of the file to be loaded
+	 * @param int     $type    Config type to load, -1 by default (detect)
+	 * @param mixed[] $default Array with the default values that will be written to the file if it did not exist
+	 * @param null    $correct reference parameter, Sets correct to true if everything has been loaded correctly
 	 */
 	public function __construct(string $file, int $type = Config::DETECT, array $default = [], &$correct = null){
 		$this->load($file, $type, $default);
@@ -140,6 +140,9 @@ class Config{
 		return preg_replace("#^( *)(y|Y|yes|Yes|YES|n|N|no|No|NO|true|True|TRUE|false|False|FALSE|on|On|ON|off|Off|OFF)( *)\:#m", "$1\"$2\"$3:", $str);
 	}
 
+	/**
+	 * @param mixed[] $default
+	 */
 	public function load(string $file, int $type = Config::DETECT, array $default = []) : bool{
 		$this->correct = true;
 		$this->file = $file;
@@ -441,6 +444,8 @@ class Config{
 	}
 
 	/**
+	 * @param mixed[] $v
+	 *
 	 * @return void
 	 */
 	public function setAll(array $v){
@@ -472,11 +477,16 @@ class Config{
 		$this->changed = true;
 	}
 
+	/**
+	 * @return mixed[]
+	 */
 	public function getAll(bool $keys = false) : array{
 		return ($keys ? array_keys($this->config) : $this->config);
 	}
 
 	/**
+	 * @param mixed[] $defaults
+	 *
 	 * @return void
 	 */
 	public function setDefaults(array $defaults){
diff --git a/src/pocketmine/utils/Terminal.php b/src/pocketmine/utils/Terminal.php
index 6fef190ee..5335a5ceb 100644
--- a/src/pocketmine/utils/Terminal.php
+++ b/src/pocketmine/utils/Terminal.php
@@ -203,7 +203,7 @@ abstract class Terminal{
 	 * Returns a string with colorized ANSI Escape codes for the current terminal
 	 * Note that this is platform-dependent and might produce different results depending on the terminal type and/or OS.
 	 *
-	 * @param string|array $string
+	 * @param string|string[] $string
 	 */
 	public static function toANSI($string) : string{
 		if(!is_array($string)){
diff --git a/src/pocketmine/utils/TextFormat.php b/src/pocketmine/utils/TextFormat.php
index 6ecfe9c8e..d02973c9b 100644
--- a/src/pocketmine/utils/TextFormat.php
+++ b/src/pocketmine/utils/TextFormat.php
@@ -68,6 +68,8 @@ abstract class TextFormat{
 
 	/**
 	 * Splits the string by Format tokens
+	 *
+	 * @return string[]
 	 */
 	public static function tokenize(string $string) : array{
 		return preg_split("/(" . TextFormat::ESCAPE . "[0-9a-fk-or])/u", $string, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
@@ -99,7 +101,7 @@ abstract class TextFormat{
 	/**
 	 * Returns an JSON-formatted string with colors/markup
 	 *
-	 * @param string|array $string
+	 * @param string|string[] $string
 	 */
 	public static function toJSON($string) : string{
 		if(!is_array($string)){
@@ -285,7 +287,7 @@ abstract class TextFormat{
 	/**
 	 * Returns an HTML-formatted string with colors/markup
 	 *
-	 * @param string|array $string
+	 * @param string|string[] $string
 	 */
 	public static function toHTML($string) : string{
 		if(!is_array($string)){
diff --git a/src/pocketmine/utils/Timezone.php b/src/pocketmine/utils/Timezone.php
index a6a3cd62d..11d260925 100644
--- a/src/pocketmine/utils/Timezone.php
+++ b/src/pocketmine/utils/Timezone.php
@@ -51,6 +51,9 @@ abstract class Timezone{
 		return ini_get('date.timezone');
 	}
 
+	/**
+	 * @return string[]
+	 */
 	public static function init() : array{
 		$messages = [];
 		do{
diff --git a/src/pocketmine/utils/Utils.php b/src/pocketmine/utils/Utils.php
index 6688beeda..0ebfada3b 100644
--- a/src/pocketmine/utils/Utils.php
+++ b/src/pocketmine/utils/Utils.php
@@ -524,6 +524,9 @@ class Utils{
 		return proc_close($process);
 	}
 
+	/**
+	 * @return mixed[]
+	 */
 	public static function decodeJWT(string $token) : array{
 		list($headB64, $payloadB64, $sigB64) = explode(".", $token);
 
@@ -569,6 +572,11 @@ class Utils{
 		return -1;
 	}
 
+	/**
+	 * @param mixed[][] $trace
+	 *
+	 * @return string[]
+	 */
 	public static function printableTrace(array $trace, int $maxStringLength = 80) : array{
 		$messages = [];
 		for($i = 0; isset($trace[$i]); ++$i){
@@ -598,6 +606,9 @@ class Utils{
 		return $messages;
 	}
 
+	/**
+	 * @return mixed[][]
+	 */
 	public static function currentTrace(int $skipFrames = 0) : array{
 		++$skipFrames; //omit this frame from trace, in addition to other skipped frames
 		if(function_exists("xdebug_get_function_stack")){
@@ -612,6 +623,9 @@ class Utils{
 		return array_values($trace);
 	}
 
+	/**
+	 * @return string[]
+	 */
 	public static function printableCurrentTrace(int $skipFrames = 0) : array{
 		return self::printableTrace(self::currentTrace(++$skipFrames));
 	}