diff --git a/docs/cache.md b/docs/cache.md
index 177f994e7..d875a5aa7 100644
--- a/docs/cache.md
+++ b/docs/cache.md
@@ -20,7 +20,7 @@ for HTTP caching. You can use this component to create and return responses that
 contain `Cache`, `Expires`, `ETag`, and `Last-Modified` headers that control
 when and how long application output is retained by client-side caches. You may have to set your php.ini setting "session.cache_limiter" to an empty string in order to get this working without interferences.
 
-* [HTTP Caching](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
+* [HTTP Caching](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
 
 ## Storage Caching
 
@@ -31,6 +31,6 @@ components provides a [PSR-6](https://www.php-fig.org/psr/psr-6/) and
 [PSR-16](https://www.php-fig.org/psr/psr-16/) compliant API for various cache backends, allowing you to take advantage
 of their blazing fast data retrieval and speed up your web application.
 
-* [Symfony Cache](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
-* [Redis](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
-* [Memcached](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
+* [Symfony Cache](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
+* [Redis](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
+* [Memcached](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
diff --git a/docs/configuration.md b/docs/configuration.md
index 132029440..fd4444a26 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -56,4 +56,4 @@ since it can contain sensitive API keys and passwords.
  
 ## Read more
 
-* [Environments and Configuration](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
+* [Environments and Configuration](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
diff --git a/docs/console.md b/docs/console.md
index d89e63aa5..c8ace9a23 100644
--- a/docs/console.md
+++ b/docs/console.md
@@ -84,4 +84,4 @@ Hello, World!
 Read more:
 
 * [Symfony Console Commands](https://symfony.com/doc/current/console.html)
-* [Console](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
+* [Console](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
diff --git a/docs/database.md b/docs/database.md
index a6a8b4a77..8cebdf62f 100644
--- a/docs/database.md
+++ b/docs/database.md
@@ -42,30 +42,30 @@ This skeleton contains [cakephp/database](https://github.com/cakephp/database) a
 The query builder provides a convenient, fluid interface for creating and executing database queries. It can be used to perform most database operations in your application, and works great with MySQL and MariaDB.
 
 * [Query Builder Documentation](https://book.cakephp.org/4/en/orm/query-builder.html)
-* [CakePHP Query Builder](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
+* [CakePHP Query Builder](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
 
 It's possible to replace the existing QueryBuilder with another component as listed below:
 
-* [Laminas Query Builder](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
-* [Laravel Query Builder](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
-* [Doctrine DBAL](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
-* [Cycle Query Builder](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
-* [PDO](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
-* [Yii Database](https://ko-fi.com/s/3698cf30f3) (Slim 4 eBook Vol. 3)
+* [Laminas Query Builder](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
+* [Laravel Query Builder](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
+* [Doctrine DBAL](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
+* [Cycle Query Builder](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
+* [PDO](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
+* [Yii Database](https://ko-fi.com/s/3698cf30f3) (Slim 4 - eBook Vol. 3)
 
 ## Read more
 
-* [Amazon S3](https://ko-fi.com/s/3698cf30f3) (Slim 4 eBook Vol. 3)
-* [Amazon DynamoDB](https://ko-fi.com/s/3698cf30f3) (Slim 4 eBook Vol. 3)
-* [Apache Cassandra](https://ko-fi.com/s/3698cf30f3) (Slim 4 eBook Vol. 3)
-* [Apache Kafka](https://ko-fi.com/s/3698cf30f3) (Slim 4 eBook Vol. 3)
-* [Couchbase](https://ko-fi.com/s/3698cf30f3) (Slim 4 eBook Vol. 3)
-* [Elasticsearch](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
-* [Doctrine CouchDB](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
-* [Firebase Realtime Database](https://ko-fi.com/s/3698cf30f3) (Slim 4 eBook Vol. 3)
-* [IBM DB2](https://ko-fi.com/s/3698cf30f3) (Slim 4 eBook Vol. 3)
-* [Oracle Database](https://ko-fi.com/s/3698cf30f3) (Slim 4 eBook Vol. 3)
-* [PostgreSQL](https://ko-fi.com/s/3698cf30f3) (Slim 4 eBook Vol. 3)
-* [Microsoft SQL Server](https://ko-fi.com/s/3698cf30f3) (Slim 4 eBook Vol. 3)
-* [Multiple database connections](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
+* [Amazon S3](https://ko-fi.com/s/3698cf30f3) (Slim 4 - eBook Vol. 3)
+* [Amazon DynamoDB](https://ko-fi.com/s/3698cf30f3) (Slim 4 - eBook Vol. 3)
+* [Apache Cassandra](https://ko-fi.com/s/3698cf30f3) (Slim 4 - eBook Vol. 3)
+* [Apache Kafka](https://ko-fi.com/s/3698cf30f3) (Slim 4 - eBook Vol. 3)
+* [Couchbase](https://ko-fi.com/s/3698cf30f3) (Slim 4 - eBook Vol. 3)
+* [Elasticsearch](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
+* [Doctrine CouchDB](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
+* [Firebase Realtime Database](https://ko-fi.com/s/3698cf30f3) (Slim 4 - eBook Vol. 3)
+* [IBM DB2](https://ko-fi.com/s/3698cf30f3) (Slim 4 - eBook Vol. 3)
+* [Oracle Database](https://ko-fi.com/s/3698cf30f3) (Slim 4 - eBook Vol. 3)
+* [PostgreSQL](https://ko-fi.com/s/3698cf30f3) (Slim 4 - eBook Vol. 3)
+* [Microsoft SQL Server](https://ko-fi.com/s/3698cf30f3) (Slim 4 - eBook Vol. 3)
+* [Multiple database connections](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
 
diff --git a/docs/deployment.md b/docs/deployment.md
index 5f7a2c4a1..c32adaa07 100644
--- a/docs/deployment.md
+++ b/docs/deployment.md
@@ -53,5 +53,5 @@ try [Apache Ant](https://ant.apache.org/), Phing or [Deployer](https://deployer.
 
 ## Read more
 
-* [Apache Ant](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
-* [Phing](https://ko-fi.com/s/3698cf30f3) (Slim 4 eBook Vol. 3)
+* [Apache Ant](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
+* [Phing](https://ko-fi.com/s/3698cf30f3) (Slim 4 - eBook Vol. 3)
diff --git a/docs/file-storage.md b/docs/file-storage.md
index 81c440c76..e291df31b 100644
--- a/docs/file-storage.md
+++ b/docs/file-storage.md
@@ -15,6 +15,6 @@ SFTP, Azure, Google Cloud, Amazon S3 etc.
 
 ## Read more
 
-* [League Flysystem v3](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
-* [League Flysystem v3 SFTP](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
-* [League Flysystem v3 AWS S3](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
+* [League Flysystem v3](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
+* [League Flysystem v3 SFTP](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
+* [League Flysystem v3 AWS S3](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
diff --git a/docs/http-client.md b/docs/http-client.md
index 3cf545575..73bbe83c9 100644
--- a/docs/http-client.md
+++ b/docs/http-client.md
@@ -39,5 +39,5 @@ $response = $client->request('GET', 'anything');
 ## Read more
 
 * [Guzzle Documentation](https://docs.guzzlephp.org/en/stable/quickstart.html)
-* [Guzzle](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
-* [Stripe](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
+* [Guzzle](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
+* [Stripe](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
diff --git a/docs/image.md b/docs/image.md
index 5ea71a6d3..85d0ffa81 100644
--- a/docs/image.md
+++ b/docs/image.md
@@ -16,4 +16,4 @@ processing libraries GD Library and Imagick.
 
 ## Read more
 
-* [Images](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
+* [Images](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
diff --git a/docs/logging.md b/docs/logging.md
index 682081edb..aa4a53e1a 100644
--- a/docs/logging.md
+++ b/docs/logging.md
@@ -82,8 +82,8 @@ $this->logger->info('File and console output');
 
 ## Read more
 
-* [Logging with Monolog](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
-* [Logging with Sentry](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
-* [Error Handling](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
+* [Logging with Monolog](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
+* [Logging with Sentry](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
+* [Error Handling](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
 
 
diff --git a/docs/mail.md b/docs/mail.md
index f939332ff..1f1d9a30c 100644
--- a/docs/mail.md
+++ b/docs/mail.md
@@ -23,5 +23,5 @@ Twig integration, CSS inlining, file attachments, signed messages and a lot more
 
 ## Read more
 
-* [Mailer](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
+* [Mailer](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
 * [Symfony Mailer Documentation](https://symfony.com/doc/current/mailer.html)
diff --git a/docs/queues.md b/docs/queues.md
index a72051366..2b305de2b 100644
--- a/docs/queues.md
+++ b/docs/queues.md
@@ -19,6 +19,6 @@ user experience to your customers.
 
 **Read more**
 
-* [Rabbit MQ](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
+* [Rabbit MQ](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
 * [RabbitMQ Tutorial for PHP](https://www.rabbitmq.com/tutorials/tutorial-one-php.html)
 * [The RabbitMQ website](https://www.rabbitmq.com/) (Website)
diff --git a/docs/renderers.md b/docs/renderers.md
index 391f7cc8f..5de26f0f5 100644
--- a/docs/renderers.md
+++ b/docs/renderers.md
@@ -57,8 +57,8 @@ Methods:
 
 ## Building a filetype specific response
 
-* [Image files](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
-* [Excel files](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
-* [PDF files](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
-* [ZIP files](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
-* [TCPDF](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
+* [Image files](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
+* [Excel files](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
+* [PDF files](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
+* [ZIP files](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
+* [TCPDF](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
diff --git a/docs/security.md b/docs/security.md
index 90d2823cd..19d5a0eed 100644
--- a/docs/security.md
+++ b/docs/security.md
@@ -45,9 +45,9 @@ are a very good tools to work with JSON Web Tokens.
 
 **Read more:** 
 
-* [Firebase JWT](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
-* [Mezzio OAuth2 Server](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
-* [JSON Web Token (JWT)](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
+* [Firebase JWT](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
+* [Mezzio OAuth2 Server](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
+* [JSON Web Token (JWT)](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
 * [OAuth Libraries for PHP](https://oauth.net/code/php/)
 * [Auth0 PHP SDK](https://auth0.com/docs/libraries/auth0-php)
 * [Stop using JWT for sessions](http://cryto.net/~joepie91/blog/2016/06/13/stop-using-jwt-for-sessions/)
@@ -55,18 +55,18 @@ are a very good tools to work with JSON Web Tokens.
 
 ## SameSite Cookies
 
-* [SameSite Cookies](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
+* [SameSite Cookies](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
 * [selective/samesite-cookie](https://github.com/selective-php/samesite-cookie)
 
 ## CSRF protection
 
-* [CSRF](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
+* [CSRF](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
 * [Slim Framework CSRF Protection](https://github.com/slimphp/Slim-Csrf)
 
 ## Cross-Origin Resource Sharing (CORS)
 
 * [Setting up CORS](https://www.slimframework.com/docs/v4/cookbook/enable-cors.html)
-* [CORS](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
+* [CORS](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
 * [middlewares/cors](https://github.com/middlewares/cors)
 
 ## Cross Site Scripting Prevention
@@ -84,10 +84,10 @@ or by using libraries that are specifically designed to sanitize HTML input:
 
 ## More Resources
 
-* [Spam Protection](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
-* [Symfony Rate Limiter](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
+* [Spam Protection](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
+* [Symfony Rate Limiter](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
 * [XSS - Cross-site Scripting Protection](https://ko-fi.com/s/3698cf30f3) (Slim 4 - eBook Vol. 3)
-* [Shieldon - Web Application Firewall](https://ko-fi.com/s/3698cf30f3) (Slim 4 eBook Vol. 3)
+* [Shieldon - Web Application Firewall](https://ko-fi.com/s/3698cf30f3) (Slim 4 - eBook Vol. 3)
 * [middlewares/firewall](https://github.com/middlewares/firewall)
 * [PSR-15 HTTP Middlewares](https://github.com/middlewares)
 * [PHP Middleware](https://github.com/php-middleware)
diff --git a/docs/session.md b/docs/session.md
index 41b6c14a5..00443af90 100644
--- a/docs/session.md
+++ b/docs/session.md
@@ -23,6 +23,6 @@ that can be accessed from subsequent requests.
 
 ## Read more
 
-* [odan/session](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
-* [RKA Slim Session Middleware](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 1)
-* [Flash Messages](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
+* [odan/session](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
+* [RKA Slim Session Middleware](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 1)
+* [Flash Messages](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
diff --git a/docs/templates.md b/docs/templates.md
index 31430ac00..18c75ead8 100644
--- a/docs/templates.md
+++ b/docs/templates.md
@@ -14,11 +14,11 @@ or the [PHP View](https://github.com/slimphp/PHP-View) package.
 
 ## Read more
 
-* [Blade](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
-* [HTMX](https://ko-fi.com/s/3698cf30f3) (Slim 4 eBook Vol. 3)
-* [Latte](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
-* [Mustache](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
-* [PHP View Templates](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
-* [Plates](https://ko-fi.com/s/3698cf30f3) (Slim 4 eBook Vol. 3)
-* [Smarty](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
-* [Twig](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
+* [Blade](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
+* [HTMX](https://ko-fi.com/s/3698cf30f3) (Slim 4 - eBook Vol. 3)
+* [Latte](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
+* [Mustache](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
+* [PHP View Templates](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
+* [Plates](https://ko-fi.com/s/3698cf30f3) (Slim 4 - eBook Vol. 3)
+* [Smarty](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
+* [Twig](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
diff --git a/docs/testing.md b/docs/testing.md
index 8b0695b78..98838b9ea 100644
--- a/docs/testing.md
+++ b/docs/testing.md
@@ -239,4 +239,4 @@ $this->mockMethod([UserReaderRepository::class, 'getUserById'])
 
 ## Read more
 
-* [Testing with PHPUnit](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
+* [Testing with PHPUnit](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
diff --git a/docs/translations.md b/docs/translations.md
index 860663ef7..f16ad07ab 100644
--- a/docs/translations.md
+++ b/docs/translations.md
@@ -13,7 +13,7 @@ There are good packages that allow you to add support for multiple languages to
 
 ## Read more
 
-* [Translations with gettext](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
-* [Twig Translations](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
-* [Symfony Translations](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
+* [Translations with gettext](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
+* [Twig Translations](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
+* [Symfony Translations](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
 * [Twig Reference](https://symfony.com/doc/current/reference/twig_reference.html#trans)
diff --git a/docs/uploading.md b/docs/uploading.md
index 8feef59bd..78c1f6251 100644
--- a/docs/uploading.md
+++ b/docs/uploading.md
@@ -19,8 +19,8 @@ See here: [Uploading files using POST forms](https://www.slimframework.com/docs/
 
 With [Filepond](https://pqina.nl/filepond/) you can upload anything, from anywhere.
 
-* [File Uploads with FilePond](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
+* [File Uploads with FilePond](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
 
 ## Read more
 
-* [File Uploads and Testing](https://ko-fi.com/s/e592c10b5f) (Slim 4 eBook Vol. 2)
+* [File Uploads and Testing](https://ko-fi.com/s/e592c10b5f) (Slim 4 - eBook Vol. 2)
diff --git a/docs/validation.md b/docs/validation.md
index ca8ada059..401fb88d2 100644
--- a/docs/validation.md
+++ b/docs/validation.md
@@ -15,9 +15,9 @@ library, complete with example validations.
 
 **Additional Resources**
 
-* [CakePHP Validation](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
-* [Symfony Validator](https://ko-fi.com/s/5f182b4b22) (Slim 4 eBook Vol. 1)
-* [Problem Details for HTTP API](https://ko-fi.com/s/3698cf30f3) (Slim 4 eBook Vol. 3)
+* [CakePHP Validation](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
+* [Symfony Validator](https://ko-fi.com/s/5f182b4b22) (Slim 4 - eBook Vol. 1)
+* [Problem Details for HTTP API](https://ko-fi.com/s/3698cf30f3) (Slim 4 - eBook Vol. 3)
 
 ## OpenAPI-based Validation
 
@@ -26,7 +26,7 @@ package can validate PSR-7 messages against OpenAPI (3.0.x) specifications expre
 
 **Additional Resources**
 
-* [OpenAPI Validation](https://ko-fi.com/s/3698cf30f3) (Slim 4 eBook Vol. 3)
+* [OpenAPI Validation](https://ko-fi.com/s/3698cf30f3) (Slim 4 - eBook Vol. 3)
 
 ## JSON schema validation
 
@@ -41,7 +41,7 @@ method is able to validate XML files against a XSD schema.
 
 **Additional Resources**
 
-* [XML Validation](https://ko-fi.com/s/3698cf30f3) (XML Validation (Slim 4 eBook Vol. 3)
+* [XML Validation](https://ko-fi.com/s/3698cf30f3) (XML Validation (Slim 4 - eBook Vol. 3)
 
 ## Assertion-Based Validation