diff --git a/server/books/migrate_document_model.py b/server/books/migrate_document_model.py
new file mode 100644
index 00000000..ab4e5b82
--- /dev/null
+++ b/server/books/migrate_document_model.py
@@ -0,0 +1,9 @@
+# -*- coding: utf-8 -*-
+#
+# Iterativ GmbH
+# http://www.iterativ.ch/
+#
+# Copyright (c) 2015 Iterativ GmbH. All rights reserved.
+#
+# Created on 2022-07-28
+# @author: lorenz.padberg@iterativ.ch
diff --git a/server/books/models/__init__.py b/server/books/models/__init__.py
index 22837b3d..09f18a39 100644
--- a/server/books/models/__init__.py
+++ b/server/books/models/__init__.py
@@ -4,3 +4,4 @@ from .topic import *
 from .chapter import *
 from .contentblock import *
 from .snapshot import *
+from .custom_document import *
diff --git a/server/books/models/custom_document.py b/server/books/models/custom_document.py
new file mode 100644
index 00000000..e719ef92
--- /dev/null
+++ b/server/books/models/custom_document.py
@@ -0,0 +1,13 @@
+from django.db import models
+
+from wagtail.documents.models import Document, AbstractDocument
+
+
+class CustomDocument(AbstractDocument):
+    # Custom field example:
+    display_text = models.CharField(
+        max_length=1024, default='')
+
+    admin_form_fields = Document.admin_form_fields + (
+        'display_text',
+    )
diff --git a/server/core/settings.py b/server/core/settings.py
index c50d249a..8078e029 100644
--- a/server/core/settings.py
+++ b/server/core/settings.py
@@ -362,6 +362,8 @@ GRAPHENE = {
 
 # http://docs.wagtail.io/en/v2.1/advanced_topics/settings.html?highlight=urls
 WAGTAIL_SITE_NAME = 'skillbox'
+WAGTAILDOCS_DOCUMENT_MODEL = 'books.CustomDocument'
+
 
 GRAPHQL_QUERIES_DIR = os.path.join(BASE_DIR, '..', 'client', 'src', 'graphql', 'gql', 'queries')
 GRAPHQL_MUTATIONS_DIR = os.path.join(GRAPHQL_QUERIES_DIR, '../mutations')