diff --git a/README.md b/README.md
index 8ad8439d..15260d58 100755
--- a/README.md
+++ b/README.md
@@ -27,10 +27,10 @@ provides a `ViewRender` that would allow you to use [Twig](https://twig.symfony.
 
 ## Installation
 
-The package could be installed with composer:
+The package could be installed with [Composer](https://getcomposer.org):
 
-```
-composer require yiisoft/view-twig --prefer-dist
+```shell
+composer require yiisoft/view-twig
 ```
 
 ## General usage
@@ -214,32 +214,12 @@ And the view template of the main page (`site/index`) will be as follows:
 </p>
 ```
 
-## Testing
-
-### Unit testing
-
-The package is tested with [PHPUnit](https://phpunit.de/). To run tests:
-
-```shell
-./vendor/bin/phpunit
-```
-
-### Mutation testing
+## Documentation
 
-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:
+- [Internals](docs/internals.md)
 
-```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
-```
+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).
 
 ## License
 
diff --git a/UPGRADE.md b/UPGRADE.md
index 4beace75..9bde0d04 100755
--- a/UPGRADE.md
+++ b/UPGRADE.md
@@ -1,4 +1,4 @@
-# Upgrading Instructions for Yii View Twig Renderer
+# Yii View Twig Renderer Upgrading Instructions 
 
 This file contains the upgrade notes for Yii Framework Twig Extension. These notes highlight changes that
 could break your application when you upgrade extension from one version to another.
diff --git a/docs/internals.md b/docs/internals.md
new file mode 100644
index 00000000..087a514a
--- /dev/null
+++ b/docs/internals.md
@@ -0,0 +1,44 @@
+# 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
+```
+
+## Code style
+
+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
+
+This package uses [composer-require-checker](https://github.com/maglnet/ComposerRequireChecker) to check if
+all dependencies are correctly defined in `composer.json`. To run the checker, execute the following command:
+
+```shell
+./vendor/bin/composer-require-checker
+```