diff --git a/src/main/java/com/miti99/storescraperbot/model/AbstractModel.java b/src/main/java/com/miti99/storescraperbot/model/AbstractModel.java
index e99fd54..8c7eef5 100644
--- a/src/main/java/com/miti99/storescraperbot/model/AbstractModel.java
+++ b/src/main/java/com/miti99/storescraperbot/model/AbstractModel.java
@@ -7,6 +7,9 @@ import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
 
+/**
+ * Con của AbstractModel phải có getter, setter & field không được final thì mới deserialize được
+ */
 @Getter
 @NoArgsConstructor
 @Setter
diff --git a/src/main/java/com/miti99/storescraperbot/model/Admin.java b/src/main/java/com/miti99/storescraperbot/model/Admin.java
index 3a1dd0c..83b3c30 100644
--- a/src/main/java/com/miti99/storescraperbot/model/Admin.java
+++ b/src/main/java/com/miti99/storescraperbot/model/Admin.java
@@ -3,8 +3,10 @@ package com.miti99.storescraperbot.model;
 import java.util.HashSet;
 import java.util.Set;
 import lombok.Getter;
+import lombok.Setter;
 
 @Getter
+@Setter
 public class Admin extends AbstractModel<String> {
-  final Set<Long> groups = new HashSet<>();
+  Set<Long> groups = new HashSet<>();
 }