diff --git a/LICENSE.md b/LICENSE.md
index bc5674fe..6a920d60 100644
--- a/LICENSE.md
+++ b/LICENSE.md
@@ -1,17 +1,17 @@
-Copyright © 2008 by Yii Software (https://www.yiiframework.com/)
+Copyright © 2008 by Yii Software (<https://www.yiiframework.com/>)
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:
 
- * Redistributions of source code must retain the above copyright
+* Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
- * Redistributions in binary form must reproduce the above copyright
+* Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in
    the documentation and/or other materials provided with the
    distribution.
- * Neither the name of Yii Software nor the names of its
+* Neither the name of Yii Software nor the names of its
    contributors may be used to endorse or promote products derived
    from this software without specific prior written permission.
 
diff --git a/README.md b/README.md
index c0fba0c4..443f0137 100644
--- a/README.md
+++ b/README.md
@@ -114,39 +114,14 @@ public function __construct()
 Note that you should not call the `exit()` or `die()` functions in the destructor or shutdown function. Since calling
 these functions in the destructor and shutdown function will prevent all subsequent completion functions from executing.
 
-## Testing
+## Documentation
 
-### Unit testing
+- [Internals](docs/internals.md)
 
-The package is tested with [PHPUnit](https://phpunit.de/). To run tests:
+## Support
 
-```shell
-./vendor/bin/phpunit
-```
-
-### Mutation testing
-
-The package tests are checked with [Infection](https://infection.github.io/) mutation framework with
-[Infection Static Analysis Plugin](https://github.com/Roave/infection-static-analysis-plugin). To run it:
-
-```shell
-./vendor/bin/roave-infection-static-analysis-plugin
-```
-
-### Static analysis
-
-The code is statically analyzed with [Psalm](https://psalm.dev/). To run static analysis:
-
-```shell
-./vendor/bin/psalm
-```
-
-## License
-
-The Yii Mutex is free software. It is released under the terms of the BSD License.
-Please see [`LICENSE`](./LICENSE.md) for more information.
-
-Maintained by [Yii Software](https://www.yiiframework.com/).
+If you need help or have a question, the [Yii Forum](https://forum.yiiframework.com/c/yii-3-0/63) is a good place for that.
+You may also check out other [Yii Community Resources](https://www.yiiframework.com/community).
 
 ## Support the project
 
@@ -159,3 +134,10 @@ Maintained by [Yii Software](https://www.yiiframework.com/).
 [![Telegram](https://img.shields.io/badge/telegram-join-1DA1F2?style=flat&logo=telegram)](https://t.me/yii3en)
 [![Facebook](https://img.shields.io/badge/facebook-join-1DA1F2?style=flat&logo=facebook&logoColor=ffffff)](https://www.facebook.com/groups/yiitalk)
 [![Slack](https://img.shields.io/badge/slack-join-1DA1F2?style=flat&logo=slack)](https://yiiframework.com/go/slack)
+
+## License
+
+The Yii Mutex is free software. It is released under the terms of the BSD License.
+Please see [`LICENSE`](./LICENSE.md) for more information.
+
+Maintained by [Yii Software](https://www.yiiframework.com/).
diff --git a/docs/internals.md b/docs/internals.md
new file mode 100644
index 00000000..b715d9fb
--- /dev/null
+++ b/docs/internals.md
@@ -0,0 +1,46 @@
+# Internals
+
+## Unit testing
+
+The package is tested with [PHPUnit](https://phpunit.de/). To run tests:
+
+```shell
+./vendor/bin/phpunit
+```
+
+## Mutation testing
+
+The package tests are checked with [Infection](https://infection.github.io/) mutation framework with
+[Infection Static Analysis Plugin](https://github.com/Roave/infection-static-analysis-plugin). To run it:
+
+```shell
+./vendor/bin/roave-infection-static-analysis-plugin
+```
+
+## Static analysis
+
+The code is statically analyzed with [Psalm](https://psalm.dev/). To run static analysis:
+
+```shell
+./vendor/bin/psalm
+```
+
+## Rector
+
+Use [Rector](https://github.com/rectorphp/rector) to make codebase follow some specific rules or
+use either newest or any specific version of PHP:
+
+```shell
+./vendor/bin/rector
+```
+
+## Dependencies
+
+Use [ComposerRequireChecker](https://github.com/maglnet/ComposerRequireChecker) to detect transitive
+[Composer](https://getcomposer.org/) dependencies.
+
+To run the checker, execute the following command:
+
+```shell
+./vendor/bin/composer-require-checker
+```