diff --git a/src/block/BlockFactory.php b/src/block/BlockFactory.php
index 7d8a24329..99f83d90e 100644
--- a/src/block/BlockFactory.php
+++ b/src/block/BlockFactory.php
@@ -59,7 +59,8 @@ use function get_class;
 use function min;
 
 /**
- * Manages block registration and instance creation
+ * Manages deserializing block types from their legacy blockIDs and metadata.
+ * This is primarily needed for loading chunks from disk.
  */
 class BlockFactory{
 	use SingletonTrait;
diff --git a/src/item/ItemFactory.php b/src/item/ItemFactory.php
index 187c14121..000235935 100644
--- a/src/item/ItemFactory.php
+++ b/src/item/ItemFactory.php
@@ -44,7 +44,8 @@ use pocketmine\utils\SingletonTrait;
 use pocketmine\world\World;
 
 /**
- * Manages Item instance creation and registration
+ * Manages deserializing item types from their legacy ID/metadata.
+ * This is primarily needed for loading inventories saved in the world (or playerdata storage).
  */
 class ItemFactory{
 	use SingletonTrait;