diff --git a/src/pocketmine/resourcepacks/ResourcePack.php b/src/pocketmine/resourcepacks/ResourcePack.php
index fd7962896..d4eeeb0e6 100644
--- a/src/pocketmine/resourcepacks/ResourcePack.php
+++ b/src/pocketmine/resourcepacks/ResourcePack.php
@@ -25,15 +25,46 @@ namespace pocketmine\resourcepacks;
 
 interface ResourcePack{
 
+	/**
+	 * Returns the human-readable name of the resource pack
+	 * @return string
+	 */
 	public function getPackName() : string;
 
+	/**
+	 * Returns the pack's UUID as a human-readable string
+	 * @return string
+	 */
 	public function getPackId() : string;
 
+	/**
+	 * Returns the size of the pack on disk in bytes.
+	 * @return int
+	 */
 	public function getPackSize() : int;
 
+	/**
+	 * Returns a version number for the pack in the format major.minor.patch
+	 * @return string
+	 */
 	public function getPackVersion() : string;
 
+	/**
+	 * Returns the raw SHA256 sum of the compressed resource pack zip. This is used by clients to validate pack downloads.
+	 * @return string byte-array length 32 bytes
+	 */
 	public function getSha256() : string;
 
+	/**
+	 * Returns a chunk of the resource pack zip as a byte-array for sending to clients.
+	 *
+	 * Note that resource packs must **always** be in zip archive format for sending.
+	 * A folder resource loader may need to perform on-the-fly compression for this purpose.
+	 *
+	 * @param int $start Offset to start reading the chunk from
+	 * @param int $length Maximum length of data to return.
+	 *
+	 * @return string byte-array
+	 */
 	public function getPackChunk(int $start, int $length) : string;
 }
\ No newline at end of file
diff --git a/src/pocketmine/resourcepacks/ResourcePackManager.php b/src/pocketmine/resourcepacks/ResourcePackManager.php
index ed47ecb57..125c31ce0 100644
--- a/src/pocketmine/resourcepacks/ResourcePackManager.php
+++ b/src/pocketmine/resourcepacks/ResourcePackManager.php
@@ -46,6 +46,10 @@ class ResourcePackManager{
 	/** @var ResourcePack[] */
 	private $uuidList = [];
 
+	/**
+	 * @param Server $server
+	 * @param string $path Path to resource-packs directory.
+	 */
 	public function __construct(Server $server, string $path){
 		$this->server = $server;
 		$this->path = $path;
@@ -103,6 +107,7 @@ class ResourcePackManager{
 	}
 
 	/**
+	 * Returns whether players must accept resource packs in order to join.
 	 * @return bool
 	 */
 	public function resourcePacksRequired() : bool{
@@ -110,6 +115,7 @@ class ResourcePackManager{
 	}
 
 	/**
+	 * Returns an array of resource packs in use, sorted in order of priority.
 	 * @return ResourcePack[]
 	 */
 	public function getResourceStack() : array{
@@ -117,8 +123,9 @@ class ResourcePackManager{
 	}
 
 	/**
-	 * @param string $id
+	 * Returns the resource pack matching the specified UUID string, or null if the ID was not recognized.
 	 *
+	 * @param string $id
 	 * @return ResourcePack|null
 	 */
 	public function getPackById(string $id){
@@ -126,6 +133,7 @@ class ResourcePackManager{
 	}
 
 	/**
+	 * Returns an array of pack IDs for packs currently in use.
 	 * @return string[]
 	 */
 	public function getPackIdList() : array{
diff --git a/src/pocketmine/resourcepacks/ZippedResourcePack.php b/src/pocketmine/resourcepacks/ZippedResourcePack.php
index f65506bbe..1f49bd8c9 100644
--- a/src/pocketmine/resourcepacks/ZippedResourcePack.php
+++ b/src/pocketmine/resourcepacks/ZippedResourcePack.php
@@ -25,13 +25,19 @@ namespace pocketmine\resourcepacks;
 
 class ZippedResourcePack implements ResourcePack{
 
+	/**
+	 * Performs basic validation checks on a resource pack's manifest.json.
+	 * TODO: add more manifest validation
+	 *
+	 * @param \stdClass $manifest
+	 * @return bool
+	 */
 	public static function verifyManifest(\stdClass $manifest){
 		if(!isset($manifest->format_version) or !isset($manifest->header) or !isset($manifest->modules)){
 			return false;
 		}
 
 		//Right now we don't care about anything else, only the stuff we're sending to clients.
-		//TODO: add more manifest validation
 		return
 			isset($manifest->header->description) and
 			isset($manifest->header->name) and
@@ -52,7 +58,9 @@ class ZippedResourcePack implements ResourcePack{
 	/** @var resource */
 	protected $fileResource;
 
-
+	/**
+	 * @param string $zipPath Path to the resource pack zip
+	 */
 	public function __construct(string $zipPath){
 		$this->path = $zipPath;