diff --git a/example/app.py b/example/app.py
index a1df2d2..3f86072 100644
--- a/example/app.py
+++ b/example/app.py
@@ -84,7 +84,12 @@ def create_sqlalchemy_app(auth_config=None):
     app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:////tmp/flask_security_example.sqlite'
     
     db = SQLAlchemy(app)
-    Security(app, SQLAlchemyUserDatastore(db))
+
+    class UserAccountMixin():
+        first_name = db.Column(db.String(120))
+        last_name = db.Column(db.String(120))
+
+    Security(app, SQLAlchemyUserDatastore(db, UserAccountMixin))
     
     @app.before_first_request
     def before_first_request():
@@ -101,7 +106,12 @@ def create_mongoengine_app(auth_config=None):
     app.config['MONGODB_PORT'] = 27017
     
     db = MongoEngine(app)
-    Security(app, MongoEngineUserDatastore(db))
+
+    class UserAccountMixin():
+        first_name = db.StringField(max_length=120)
+        last_name = db.StringField(max_length=120)
+
+    Security(app, MongoEngineUserDatastore(db, UserAccountMixin))
     
     @app.before_first_request
     def before_first_request():
diff --git a/flask_security/__init__.py b/flask_security/__init__.py
index 0ed3995..49a98bb 100644
--- a/flask_security/__init__.py
+++ b/flask_security/__init__.py
@@ -256,6 +256,7 @@ class Security(object):
         """
         if app is None or datastore is None: return
         
+        # TODO: change blueprint name
         blueprint = Blueprint('auth', __name__)
         
         configured = {}
diff --git a/flask_security/datastore/__init__.py b/flask_security/datastore/__init__.py
index 2bf605b..ef02910 100644
--- a/flask_security/datastore/__init__.py
+++ b/flask_security/datastore/__init__.py
@@ -21,8 +21,9 @@ class UserDatastore(object):
     :param db: An instance of a configured databse manager from a Flask 
                extension such as Flask-SQLAlchemy or Flask-MongoEngine"""
     
-    def __init__(self, db):
+    def __init__(self, db, user_account_mixin=None):
         self.db = db
+        self.user_account_mixin = user_account_mixin or object
         
     def get_models(self):
         """Returns configured `User` and `Role` models for the datastore 
diff --git a/flask_security/datastore/mongoengine.py b/flask_security/datastore/mongoengine.py
index 8894a21..7e28c39 100644
--- a/flask_security/datastore/mongoengine.py
+++ b/flask_security/datastore/mongoengine.py
@@ -41,7 +41,7 @@ class MongoEngineUserDatastore(UserDatastore):
             name = db.StringField(required=True, unique=True, max_length=80)
             description = db.StringField(max_length=255)
               
-        class User(db.Document, UserMixin):
+        class User(db.Document, UserMixin, self.user_account_mixin):
             """MongoEngine User model"""
             
             username = db.StringField(unique=True, max_length=255)
diff --git a/flask_security/datastore/sqlalchemy.py b/flask_security/datastore/sqlalchemy.py
index 5fe3d55..e239b51 100644
--- a/flask_security/datastore/sqlalchemy.py
+++ b/flask_security/datastore/sqlalchemy.py
@@ -48,7 +48,7 @@ class SQLAlchemyUserDatastore(UserDatastore):
                 self.name = name
                 self.description = description
               
-        class User(db.Model, UserMixin):
+        class User(db.Model, UserMixin, self.user_account_mixin):
             """SQLAlchemy User model"""
             
             id = db.Column(db.Integer, primary_key=True)