django orm stepping on the pit

(venv) C:\item>python manage.py makemigrations
No changes detected

setting.py add app name

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'item0',
]