How do I remove this warning?

Error:

  

C: \ Python3 \ lib \ site-packages \ flask_sqlalchemy__init __. py: 839: FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the future. Set it to True or False to suppress this warning.     'SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and'

my code:

from flask import Flask
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///base.db'
db = SQLAlchemy(app)


####################################################################
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True)
    email = db.Column(db.String(120), unique=True)

    def __init__(self, username, email):
        self.username = username
        self.email = email

    def __repr__(self):
        return '<User %r>' % self.username
#####################################################################

if __name__ == '__main__':
    db.create_all()