diff --git a/src/pocketmine/level/ChunkLoader.php b/src/pocketmine/level/ChunkLoader.php
index 144b55192..b4d60f43e 100644
--- a/src/pocketmine/level/ChunkLoader.php
+++ b/src/pocketmine/level/ChunkLoader.php
@@ -78,6 +78,8 @@ interface ChunkLoader{
 	 * This method will be called when a Chunk is replaced by a new one
 	 *
 	 * @param Chunk $chunk
+	 *
+	 * @return void
 	 */
 	public function onChunkChanged(Chunk $chunk);
 
@@ -85,6 +87,8 @@ interface ChunkLoader{
 	 * This method will be called when a registered chunk is loaded
 	 *
 	 * @param Chunk $chunk
+	 *
+	 * @return void
 	 */
 	public function onChunkLoaded(Chunk $chunk);
 
@@ -93,6 +97,8 @@ interface ChunkLoader{
 	 * This method will be called when a registered chunk is unloaded
 	 *
 	 * @param Chunk $chunk
+	 *
+	 * @return void
 	 */
 	public function onChunkUnloaded(Chunk $chunk);
 
@@ -101,6 +107,8 @@ interface ChunkLoader{
 	 * Usually it'll be sent with another call to onChunkChanged()
 	 *
 	 * @param Chunk $chunk
+	 *
+	 * @return void
 	 */
 	public function onChunkPopulated(Chunk $chunk);
 
@@ -108,6 +116,8 @@ interface ChunkLoader{
 	 * This method will be called when a block changes in a registered chunk
 	 *
 	 * @param Block|Vector3 $block
+	 *
+	 * @return void
 	 */
 	public function onBlockChanged(Vector3 $block);
 
diff --git a/src/pocketmine/level/ChunkManager.php b/src/pocketmine/level/ChunkManager.php
index ce17eec12..db985801d 100644
--- a/src/pocketmine/level/ChunkManager.php
+++ b/src/pocketmine/level/ChunkManager.php
@@ -44,6 +44,8 @@ interface ChunkManager{
 	 * @param int $y
 	 * @param int $z
 	 * @param int $id 0-255
+	 *
+	 * @return void
 	 */
 	public function setBlockIdAt(int $x, int $y, int $z, int $id);
 
@@ -65,6 +67,8 @@ interface ChunkManager{
 	 * @param int $y
 	 * @param int $z
 	 * @param int $data 0-15
+	 *
+	 * @return void
 	 */
 	public function setBlockDataAt(int $x, int $y, int $z, int $data);
 
@@ -86,6 +90,8 @@ interface ChunkManager{
 	 * @param int $y
 	 * @param int $z
 	 * @param int $level
+	 *
+	 * @return void
 	 */
 	public function setBlockLightAt(int $x, int $y, int $z, int $level);
 
@@ -107,6 +113,8 @@ interface ChunkManager{
 	 * @param int $y
 	 * @param int $z
 	 * @param int $level
+	 *
+	 * @return void
 	 */
 	public function setBlockSkyLightAt(int $x, int $y, int $z, int $level);
 
@@ -122,6 +130,8 @@ interface ChunkManager{
 	 * @param int        $chunkX
 	 * @param int        $chunkZ
 	 * @param Chunk|null $chunk
+	 *
+	 * @return void
 	 */
 	public function setChunk(int $chunkX, int $chunkZ, Chunk $chunk = null);
 
diff --git a/src/pocketmine/level/SimpleChunkManager.php b/src/pocketmine/level/SimpleChunkManager.php
index dba9854bf..fd89c6c4a 100644
--- a/src/pocketmine/level/SimpleChunkManager.php
+++ b/src/pocketmine/level/SimpleChunkManager.php
@@ -71,6 +71,8 @@ class SimpleChunkManager implements ChunkManager{
 	 * @param int $y
 	 * @param int $z
 	 * @param int $id 0-255
+	 *
+	 * @return void
 	 */
 	public function setBlockIdAt(int $x, int $y, int $z, int $id){
 		if($chunk = $this->getChunk($x >> 4, $z >> 4)){
@@ -101,6 +103,8 @@ class SimpleChunkManager implements ChunkManager{
 	 * @param int $y
 	 * @param int $z
 	 * @param int $data 0-15
+	 *
+	 * @return void
 	 */
 	public function setBlockDataAt(int $x, int $y, int $z, int $data){
 		if($chunk = $this->getChunk($x >> 4, $z >> 4)){
@@ -150,6 +154,8 @@ class SimpleChunkManager implements ChunkManager{
 	 * @param int        $chunkX
 	 * @param int        $chunkZ
 	 * @param Chunk|null $chunk
+	 *
+	 * @return void
 	 */
 	public function setChunk(int $chunkX, int $chunkZ, Chunk $chunk = null){
 		if($chunk === null){
@@ -159,6 +165,9 @@ class SimpleChunkManager implements ChunkManager{
 		$this->chunks[Level::chunkHash($chunkX, $chunkZ)] = $chunk;
 	}
 
+	/**
+	 * @return void
+	 */
 	public function cleanChunks(){
 		$this->chunks = [];
 	}