diff --git a/src/main/java/cactusServer/entities/Area.java b/src/main/java/cactusServer/entities/Area.java
index 3dc0ee4..5fec585 100644
--- a/src/main/java/cactusServer/entities/Area.java
+++ b/src/main/java/cactusServer/entities/Area.java
@@ -2,10 +2,13 @@
 
 import java.util.HashSet;
 
+import net.arnx.jsonic.JSONHint;
+
 public class Area extends Entity{
 	private String name;
 	private Plain[] region; // �C�ӌ‚̕��ʂ̕�����
 	private HashSet<Allowed> permissions; // �G���A���ʼn”\�Ȃ��Ƃ̗���
+	@JSONHint(ignore = true) public static final int UNIQUE_ID_LENGTH = 12;
 
 	private Area() {
 		// JSONDecode���̌Ăяo���p