diff --git a/src/data/bedrock/blockstate/upgrade/model/BlockStateUpgradeSchemaModel.php b/src/data/bedrock/blockstate/upgrade/model/BlockStateUpgradeSchemaModel.php
index 324cd13f4..4827082c9 100644
--- a/src/data/bedrock/blockstate/upgrade/model/BlockStateUpgradeSchemaModel.php
+++ b/src/data/bedrock/blockstate/upgrade/model/BlockStateUpgradeSchemaModel.php
@@ -69,6 +69,9 @@ final class BlockStateUpgradeSchemaModel implements \JsonSerializable{
 	 */
 	public array $remappedPropertyValues;
 
+	/**
+	 * @return mixed[]
+	 */
 	public function jsonSerialize() : array{
 		$result = (array) $this;