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+++ b/README.md
@@ -2,22 +2,116 @@
 
 ## Description
 
-FTL-Extract is a Python package that extracts Fluent keys from .py files
-and generates a .ftl file with extracted keys.
+FTL-Extract is a Python package that extracts Fluent keys from .py files and generates a .ftl file with extracted keys.
 
 ## Installation
 
-Use the package manager [pip](https://pip.pypa.io/en/stable) to install
-FTL-Extract.
+Use the package manager [pip](https://pip.pypa.io/en/stable) to install FTL-Extract.
 
-``` bash
-pip install FTL-Extract
+```shell
+$ pip install FTL-Extract
 ```
 
+Or add it to your `pyproject.toml` and run `poetry update`
+
 ## Usage
 
-``` bash
-ftl_extract code_path output_path
+First of all, you should to create locales directory in your project.
+
+```shell
+$ mkdir project_path/locales
+```
+
+Then, you can use the following command to extract keys from your code.
+
+```shell
+$ ftl_extract project_path/code_path project_path/locales
+```
+
+By default, FTL-Extract will create a directory named `en` and put all keys into `_default.ftl` file.
+
+In more cases, you may want to extract keys to specific `.ftl` files.
+So, you must add `_path` argument to `i18n.get` function in your code.
+
+```python
+# Before
+i18n.get("key-1", arg1="value1", arg2="value2")
+
+# After
+i18n.get("key-1", arg1="value1", arg2="value2", _path="dir/ftl_file.ftl")
+```
+
+## FAQ
+
+#### ❓ - What changed 🤔
+
+You just need to add `_path` argument to `i18n.get` function and specify the path to the `.ftl` file where you want to
+put the key.
+
+It may be just a filename like `file.ftl` or a path to a file like `dir/file.ftl`.
+
+#### ❓ - My `FluentRuntimeCore` throws an error 🤯, when I use `_path` argument
+
+Now there is a little problem with integration with [aiogram-i18n](https://github.com/aiogram/i18n)
+
+To fix any possible problems - when you create a `i18n` middleware in your code:
+
+```python
+i18n_middleware = I18nMiddleware(
+    core=FluentRuntimeCore(path=Path(__file__).parent / "locales" / "{locale}"),
+    manager=FSMManager(),
+)
+```
+
+you should replace `FluentRuntimeCore` with your own patched core.
+
+_**🤖 Example of your own `Core`**_
+
+```python
+class CustomFluentRuntimeCore(FluentRuntimeCore):
+    def get(self, message_id: str, locale: Optional[str] = None, /, **kwargs: Any) -> str:
+
+    # PATCH START #
+    kwargs.pop("_path", None)
+    # PATCH END #
+
+    locale = self.get_locale(locale=locale)
+    translator: FluentBundle = self.get_translator(locale=locale)
+    ...
+```
+
+Then just use this `CustomFluentRuntimeCore` in your `i18n` middleware as erlier.
+
+#### ❓ - How to add more languages to the project ?
+
+```shell
+# Here we add 3 languages: English, Ukrainian and Polish
+$ ftl_extract project_path/code_path project_path/locales -l en -l uk -l pl
+```
+
+#### ❓ - How to detect another i18n keys like `LazyProxy` or `L` ?
+
+```shell
+# Here we extract ftl keys from i18n-keys like `i18n`, `LF`, `LazyProxy` and `L`
+$ ftl_extract project_path/code_path project_path/locales -k i18n -k LF -k LazyProxy -k L
+```
+
+## How I use FTL-Extract in most of my projects
+
+```shell
+$ ftl_extract \
+  '.\app\bot' \
+  '.\app\bot\locales' \
+  -l 'en' \
+  -l 'uk' \
+  -l 'pl' \
+  -l 'de' \
+  -l 'ja' \
+  -l 'ru' \
+  -k 'i18n' \
+  -k 'L' \
+  -k 'LF' \
+  -k 'LazyProxy'
 ```
 
 ## Contributing