diff --git a/src/world/World.php b/src/world/World.php
index 05135cb6b..5e5d6061d 100644
--- a/src/world/World.php
+++ b/src/world/World.php
@@ -949,6 +949,9 @@ class World implements ChunkManager{
 		}
 	}
 
+	/**
+	 * @return mixed[]
+	 */
 	public function __debugInfo() : array{
 		return [];
 	}
diff --git a/src/world/format/io/WritableWorldProvider.php b/src/world/format/io/WritableWorldProvider.php
index ca0069bd8..95a11f704 100644
--- a/src/world/format/io/WritableWorldProvider.php
+++ b/src/world/format/io/WritableWorldProvider.php
@@ -28,6 +28,8 @@ use pocketmine\world\format\Chunk;
 interface WritableWorldProvider extends WorldProvider{
 	/**
 	 * Generate the needed files in the path given
+	 *
+	 * @param mixed[] $options
 	 */
 	public static function generate(string $path, string $name, int $seed, string $generator, array $options = []) : void;
 
diff --git a/src/world/generator/Flat.php b/src/world/generator/Flat.php
index 2e6f370cb..01d6d6e58 100644
--- a/src/world/generator/Flat.php
+++ b/src/world/generator/Flat.php
@@ -51,6 +51,8 @@ class Flat extends Generator{
 	private $preset;
 
 	/**
+	 * @param mixed[] $options
+	 *
 	 * @throws InvalidGeneratorOptionsException
 	 */
 	public function __construct(ChunkManager $world, int $seed, array $options = []){
diff --git a/src/world/generator/Generator.php b/src/world/generator/Generator.php
index e428e51be..23906d24b 100644
--- a/src/world/generator/Generator.php
+++ b/src/world/generator/Generator.php
@@ -60,6 +60,8 @@ abstract class Generator{
 
 	/**
 	 * @throws InvalidGeneratorOptionsException
+	 *
+	 * @param mixed[] $options
 	 */
 	public function __construct(ChunkManager $world, int $seed, array $options = []){
 		$this->world = $world;
diff --git a/src/world/generator/GeneratorRegisterTask.php b/src/world/generator/GeneratorRegisterTask.php
index 7b2376b5e..d6d7f7e5b 100644
--- a/src/world/generator/GeneratorRegisterTask.php
+++ b/src/world/generator/GeneratorRegisterTask.php
@@ -43,6 +43,9 @@ class GeneratorRegisterTask extends AsyncTask{
 	/** @var int */
 	public $worldHeight = World::Y_MAX;
 
+	/**
+	 * @param mixed[] $generatorSettings
+	 */
 	public function __construct(World $world, string $generatorClass, array $generatorSettings = []){
 		$this->generatorClass = $generatorClass;
 		$this->settings = serialize($generatorSettings);
diff --git a/src/world/generator/hell/Nether.php b/src/world/generator/hell/Nether.php
index d6dabd4e7..1b9c645ec 100644
--- a/src/world/generator/hell/Nether.php
+++ b/src/world/generator/hell/Nether.php
@@ -51,6 +51,8 @@ class Nether extends Generator{
 	private $noiseBase;
 
 	/**
+	 * @param mixed[] $options
+	 *
 	 * @throws InvalidGeneratorOptionsException
 	 */
 	public function __construct(ChunkManager $world, int $seed, array $options = []){
diff --git a/src/world/generator/noise/Noise.php b/src/world/generator/noise/Noise.php
index 9bee809b4..b3ff570c5 100644
--- a/src/world/generator/noise/Noise.php
+++ b/src/world/generator/noise/Noise.php
@@ -263,6 +263,9 @@ abstract class Noise{
 		return $noiseArray;
 	}
 
+	/**
+	 * @return float[][][]
+	 */
 	public function getFastNoise3D(int $xSize, int $ySize, int $zSize, int $xSamplingRate, int $ySamplingRate, int $zSamplingRate, int $x, int $y, int $z) : array{
 
 		assert($xSamplingRate !== 0, new \InvalidArgumentException("xSamplingRate cannot be 0"));
diff --git a/src/world/generator/normal/Normal.php b/src/world/generator/normal/Normal.php
index edb03999c..9cfc25538 100644
--- a/src/world/generator/normal/Normal.php
+++ b/src/world/generator/normal/Normal.php
@@ -58,6 +58,8 @@ class Normal extends Generator{
 	private static $SMOOTH_SIZE = 2;
 
 	/**
+	 * @param mixed[] $options
+	 *
 	 * @throws InvalidGeneratorOptionsException
 	 */
 	public function __construct(ChunkManager $world, int $seed, array $options = []){