diff --git a/src/main/java/com/sparrowwallet/drongo/wallet/Persistable.java b/src/main/java/com/sparrowwallet/drongo/wallet/Persistable.java
index 9d6712f..4267055 100644
--- a/src/main/java/com/sparrowwallet/drongo/wallet/Persistable.java
+++ b/src/main/java/com/sparrowwallet/drongo/wallet/Persistable.java
@@ -1,6 +1,8 @@
 package com.sparrowwallet.drongo.wallet;
 
 public class Persistable {
+    public static final int MAX_LABEL_LENGTH = 255;
+
     private Long id;
 
     public Long getId() {