diff --git a/docs/customize/users.md b/docs/customize/users.md
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+# Adding Users to Invenio ILS instance
+
+This guide provides step-by-step instructions for adding users to a custom Invenio App ILS instance using:
+
+- An existing database
+- LDAP synchronization
+
+!!! Note
+    The following guides are just an example to give you an idea of how you can get started on existing users to your Invenio ILS instance!
+
+    Similar scripts can also be used to port other cataloging data like Documents, E-Items, Purchase Orders and more!
+
+This process is suitable for administrators who have just set up a new instance and want to onboard all users to the ILS database.
+
+### Prerequisites
+
+- A running instance of Invenio App ILS.
+- Administrative access to the Invenio App ILS instance.
+- Python installed on your system.
+
+## Adding Users to Invenio App ILS Instance using LDAP Sync
+
+### Step 1: Install LDAP3
+
+First, ensure that the `ldap3` library is installed. You can install it using pip:
+
+```bash
+pip install ldap3
+```
+
+Make sure you have access to the LDAP directory with user data.
+
+### Step 2: Configure LDAP Connection
+
+Create or update the configuration file for your Invenio App ILS instance to include LDAP connection details. Add the following configuration variables:
+
+```python
+LDAP_SERVER = 'ldap://your-ldap-server.com'
+LDAP_BIND_USER_DN = 'cn=admin,dc=example,dc=com'
+LDAP_BIND_PASSWORD = 'your-bind-password'
+
+LDAP_BASE_DN = 'ou=users,dc=example,dc=com'
+LDAP_USER_FILTER = '(objectClass=person)'
+
+LDAP_USER_FIELDS_MAPPING = {
+    'email': 'mail',
+    'username': 'uid',
+    'first_name': 'givenName',
+    'last_name': 'sn',
+}
+```
+
+### Step 3: Create a Script for LDAP Sync
+
+Create a Python script to synchronize LDAP users with the Invenio App ILS database. Save the following script as `ldap_sync.py`:
+
+```python
+import os
+from ldap3 import Server, Connection, ALL
+from invenio_accounts.models import User
+from invenio_db import db
+
+# Load configuration
+LDAP_SERVER = os.getenv('LDAP_SERVER', 'ldap://your-ldap-server.com')
+LDAP_BIND_USER_DN = os.getenv('LDAP_BIND_USER_DN', 'cn=admin,dc=example,dc=com')
+LDAP_BIND_PASSWORD = os.getenv('LDAP_BIND_PASSWORD', 'your-bind-password')
+LDAP_BASE_DN = os.getenv('LDAP_BASE_DN', 'ou=users,dc=example,dc=com')
+LDAP_USER_FILTER = os.getenv('LDAP_USER_FILTER', '(objectClass=person)')
+LDAP_USER_FIELDS_MAPPING = {
+    'email': os.getenv('LDAP_FIELD_EMAIL', 'mail'),
+    'username': os.getenv('LDAP_FIELD_USERNAME', 'uid'),
+    'first_name': os.getenv('LDAP_FIELD_FIRST_NAME', 'givenName'),
+    'last_name': os.getenv('LDAP_FIELD_LAST_NAME', 'sn'),
+}
+
+def ldap_sync():
+    # Connect to the LDAP server
+    server = Server(LDAP_SERVER, get_info=ALL)
+    conn = Connection(server, LDAP_BIND_USER_DN, LDAP_BIND_PASSWORD, auto_bind=True)
+
+    # Search for users
+    conn.search(LDAP_BASE_DN, LDAP_USER_FILTER, attributes=list(LDAP_USER_FIELDS_MAPPING.values()))
+
+    for entry in conn.entries:
+        # Extract user details
+        user_data = {field: getattr(entry, ldap_field, [None])[0] for field, ldap_field in LDAP_USER_FIELDS_MAPPING.items()}
+
+        # Check if the user already exists
+        user = User.query.filter_by(email=user_data['email']).first()
+
+        if user is None:
+            # Create a new user
+            user = User(
+                email=user_data['email'],
+                username=user_data['username'],
+                active=True,
+                profile=dict(
+                    full_name=f"{user_data['first_name']} {user_data['last_name']}",
+                ),
+            )
+            db.session.add(user)
+            print(f"Added new user: {user.email}")
+        else:
+            # Update existing user
+            user.username = user_data['username']
+            user.profile['full_name'] = f"{user_data['first_name']} {user_data['last_name']}"
+            print(f"Updated existing user: {user.email}")
+
+    # Commit the changes
+    db.session.commit()
+    print("LDAP synchronization complete.")
+
+if __name__ == '__main__':
+    ldap_sync()
+```
+
+## Adding Users to Invenio App ILS Instance from a Custom Database
+
+### Step 1: Install Required Packages
+
+Ensure that the required Python packages are installed. You can install them using pip:
+
+```bash
+pip install sqlalchemy
+```
+
+Make sure you have access to the custom user database.
+
+### Step 2: Configure Database Connection
+
+Create a configuration file or environment variables to store your database connection details. Here's an example of setting up a configuration file:
+
+````python
+CUSTOM_DB_URI = 'postgresql://user:password@localhost/customdb'
+INVENIO_DB_URI = 'postgresql://invenio:password@localhost/invenio'```
+````
+
+### Step 3: Create a Script to Port Users
+
+Create a Python script to read users from the custom database and add them to the Invenio App ILS database. Save the following script as **port_users.py**:
+
+```python
+import os
+from sqlalchemy import create_engine, MetaData, Table
+from sqlalchemy.orm import sessionmaker
+from invenio_accounts.models import User
+from invenio_db import db
+from invenio_app.factory import create_api
+
+# Load configuration
+custom_db_uri = os.getenv('CUSTOM_DB_URI', 'postgresql://user:password@localhost/customdb')
+invenio_db_uri = os.getenv('INVENIO_DB_URI', 'postgresql://invenio:password@localhost/invenio')
+
+# Create SQLAlchemy engines and sessions
+custom_engine = create_engine(custom_db_uri)
+invenio_engine = create_engine(invenio_db_uri)
+
+CustomSession = sessionmaker(bind=custom_engine)
+InvenioSession = sessionmaker(bind=invenio_engine)
+
+custom_session = CustomSession()
+invenio_session = InvenioSession()
+
+# Define the custom user table (adjust to match your schema)
+metadata = MetaData()
+users_table = Table('users', metadata, autoload_with=custom_engine)
+
+def port_users():
+    # Query all users from the custom database
+    custom_users = custom_session.query(users_table).all()
+
+    for custom_user in custom_users:
+        # Extract user details (adjust to match your schema)
+        email = custom_user.email
+        username = custom_user.username
+        first_name = custom_user.first_name
+        last_name = custom_user.last_name
+
+        # Check if the user already exists in Invenio ILS DB
+        user = invenio_session.query(User).filter_by(email=email).first()
+
+        if user is None:
+            # Create a new user
+            user = User(
+                email=email,
+                username=username,
+                active=True,
+                profile=dict(
+                    full_name=f"{first_name} {last_name}",
+                ),
+            )
+            invenio_session.add(user)
+            print(f"Added new user: {email}")
+        else:
+            # Update existing user
+            user.username = username
+            user.profile['full_name'] = f"{first_name} {last_name}"
+            print(f"Updated existing user: {email}")
+
+    # Commit the changes
+    invenio_session.commit()
+    print("User porting complete.")
+
+if __name__ == '__main__':
+    # Initialize Invenio app context
+    app = create_api()
+    with app.app_context():
+        port_users()
+
+    # Close sessions
+    custom_session.close()
+    invenio_session.close()
+```
+
+### Additional Tips
+
+You may schedule the script to run periodically (e.g., using a cron job) if you need to keep the Invenio user database in sync with your custom database/LDAP directory.
+
+Feel free to adjust the configurations and script to better fit your specific environment and requirements.
diff --git a/mkdocs.yml b/mkdocs.yml
index 954a36a..c0b3ee0 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -26,6 +26,7 @@ nav:
     - Local development: customize/develop.md
     - Static pages: customize/static_pages.md
     - User anonymization: customize/anonymization.md
+    -  Adding Users to the instance: customize/users.md
     - Vocabularies: customize/vocabularies.md
   - Reference:
     - Understanding data model: reference/data_model.md