diff --git a/README.md b/README.md
index f2033e7..cf40e7e 100644
--- a/README.md
+++ b/README.md
@@ -7,5 +7,6 @@ To contribute, please open pull requests against the master branch.
 You can run a local preview of the docs by running the following command in the project folder:
 
 ```
+npm i docsify-cli -g
 npx docsify serve
 ```
\ No newline at end of file
diff --git a/_sidebar.md b/_sidebar.md
index 8db01f7..6b30e18 100644
--- a/_sidebar.md
+++ b/_sidebar.md
@@ -13,6 +13,7 @@
   - [Generate adapter](custom-objects/generate_adapter.md)
   - [HiveObject](custom-objects/hive_object.md)
   - [Relationships](custom-objects/relationships.md)
+  - [Inheritance](custom-objects/inheritance.md)
   - [Create adapter manually](custom-objects/create_adapter_manually.md)
 
 - Flutter Tutorials
diff --git a/custom-objects/inheritance.md b/custom-objects/inheritance.md
new file mode 100644
index 0000000..868b887
--- /dev/null
+++ b/custom-objects/inheritance.md
@@ -0,0 +1,84 @@
+# Inheritance
+
+Always register the base clase for last. Example
+
+
+```dart
+import 'package:hive/hive.dart';
+
+part 'models.g.dart';
+
+@HiveType(typeId: 0)
+class Person extends HiveObject {
+  @HiveField(0)
+  List<Pet> pets = [];
+
+  @HiveField(1)
+  String name = "";
+
+  @HiveField(2)
+  Cat cat = Cat();
+
+  @HiveField(3)
+  Dog dog = Dog();
+
+  Person();
+}
+
+@HiveType(typeId: 1)
+class Pet extends HiveObject {
+  @HiveField(0)
+  String name = "";
+}
+
+@HiveType(typeId: 2)
+class Dog extends Pet {
+  @HiveField(1)
+  String someDogField = "";
+
+  Dog() : super();
+}
+
+@HiveType(typeId: 3)
+class Cat extends Pet {
+  @HiveField(1)
+  String someCatField = "";
+
+  Cat() : super();
+}
+
+
+Future<void> main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+  await Hive.initFlutter();
+  Hive.registerAdapter<Person>(PersonAdapter());
+  Hive.registerAdapter<Dog>(DogAdapter());
+  Hive.registerAdapter<Cat>(CatAdapter());
+  Hive.registerAdapter<Pet>(PetAdapter()); # FOR LAST !!!
+
+  Box<Person> boxPersons = await Hive.openBox<Person>("persons");
+  if (boxPersons.values.isEmpty) {
+    print("Adding a new person");
+
+    Person person = Person()
+      ..name = "person 1"
+      ..pets = [
+        Pet()..name = "pet 1",
+        Pet()..name = "pet 2",
+        Pet()..name = "pet 3",
+      ]
+      ..dog = (Dog()
+        ..name = "doggy"
+        ..someDogField = "waw")
+      ..cat = (Cat()
+        ..name = "pussy"
+        ..someCatField = "meau");
+
+    boxPersons.put(0, person);
+  } else {
+    print(boxPersons.values);
+  }
+
+  runApp(MyApp());
+}
+```