diff --git a/README.md b/README.md
index 4404b78..586bbf8 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # Injection
 
 ![PyPI - Version](https://img.shields.io/pypi/v/deps-injection?label=pypi%20version)
-[![GitHub license](https://img.shields.io/github/license/nightblure/injection)](https://github.com/nightblure/injection/blob/main/LICENSE)
+![GitHub License](https://img.shields.io/github/license/nightblure/injection?color=012111012)
 
 ![PyPI - Python Version](https://img.shields.io/pypi/pyversions/deps-injection)
 
@@ -13,14 +13,132 @@
 
 [![Ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json)](https://github.com/astral-sh/ruff)
 [![Hatch project](https://img.shields.io/badge/%F0%9F%A5%9A-Hatch-4051b5.svg)](https://github.com/pypa/hatch)
-![GitHub Repo stars](https://img.shields.io/github/stars/nightblure/injection)
+[![Maintainability](https://api.codeclimate.com/v1/badges/1da49eb0b28eacae4624/maintainability)](https://codeclimate.com/github/nightblure/injection/maintainability)
 
-![PyPI - Month Downloads](https://img.shields.io/pypi/dm/deps-injection?color=102255102)
+![GitHub Repo stars](https://img.shields.io/github/stars/nightblure/injection)
 ![GitHub Downloads (all assets, all releases)](https://img.shields.io/github/downloads/nightblure/injection/total?color=102255102&label=Total%20downloads)
+![PyPI - Month Downloads](https://img.shields.io/pypi/dm/deps-injection?color=102255102)
 
 ---
 
-## Features
+Easy dependency injection for all, works with Python 3.8-3.12. Main features and advantages:
 * support **Python 3.8-3.12**;
 * works with **FastAPI, Flask, Litestar** and **Django REST Framework**;
+* dependency injection via `Annotated` in FastAPI;
 * **no third-party dependencies**;
+* **multiple containers**;
+* **overriding** dependencies for tests without wiring;
+* **100%** code coverage and very simple code;
+* good [documentation](https://injection.readthedocs.io/latest/).
+
+---
+
+## Installation
+```shell
+pip install deps-injection
+```
+
+## Using example
+
+```python3
+import sys
+
+if sys.version_info >= (3, 9):
+    from typing import Annotated
+else:
+    from typing import Annotated
+from unittest.mock import Mock
+
+import pytest
+from fastapi import APIRouter, Depends, FastAPI
+from fastapi.testclient import TestClient
+from injection import DeclarativeContainer, Provide, inject, providers
+
+
+class Settings:
+    redis_url: str = "redis://localhost"
+    redis_port: int = 6379
+
+
+class Redis:
+    def __init__(self, *, url: str, port: int):
+        self.uri = url + ":" + str(port)
+        self.url = url
+        self.port = port
+
+    def get(self, key):
+        return key
+
+
+class Container(DeclarativeContainer):
+    settings = providers.Singleton(Settings)
+    redis = providers.Singleton(
+        Redis,
+        port=settings.provided.redis_port,
+        url=settings.provided.redis_url,
+    )
+
+
+router = APIRouter(prefix="/api")
+
+
+def create_app():
+    app = FastAPI()
+    app.include_router(router)
+    return app
+
+
+RedisDependency = Annotated[Redis, Depends(Provide["redis"])]
+RedisDependencyExplicit = Annotated[Redis, Depends(Provide[Container.redis])]
+
+
+@router.get("/values")
+@inject
+def some_get_endpoint_handler(redis: RedisDependency):
+    value = redis.get(299)
+    return {"detail": value}
+
+
+@router.post("/values")
+@inject
+async def some_get_async_endpoint_handler(redis: RedisDependencyExplicit):
+    value = redis.get(399)
+    return {"detail": value}
+
+
+###################### TESTING ######################
+@pytest.fixture(scope="session")
+def app():
+    return create_app()
+
+
+@pytest.fixture(scope="session")
+def container():
+    return Container.instance()
+
+
+@pytest.fixture()
+def test_client(app):
+    client = TestClient(app)
+    return client
+
+
+def test_override_providers(test_client, container):
+    def mock_get_method(_):
+        return "mock_get_method"
+
+    mock_redis = Mock()
+    mock_redis.get = mock_get_method
+
+    providers_to_override = {"redis": mock_redis}
+
+    with container.override_providers(providers_to_override):
+        response = test_client.get("/api/values")
+
+    assert response.status_code == 200
+    body = response.json()
+    assert body["detail"] == "mock_get_method"
+
+```
+
+---
diff --git a/tests/test_integrations/test_fastapi/app.py b/tests/test_integrations/test_fastapi/app.py
index 88dc32b..eb732c4 100644
--- a/tests/test_integrations/test_fastapi/app.py
+++ b/tests/test_integrations/test_fastapi/app.py
@@ -8,9 +8,6 @@
 @asynccontextmanager
 async def lifespan_handler(_):
     yield
-    # Container.wire()
-    # yield
-    # Container.unwire()
 
 
 def create_app():