diff --git a/docs/book/v4/tutorials/create-book-module.md b/docs/book/v4/tutorials/create-book-module.md
index 56cb629..1da834e 100644
--- a/docs/book/v4/tutorials/create-book-module.md
+++ b/docs/book/v4/tutorials/create-book-module.md
@@ -4,27 +4,29 @@
 
 The below file structure is just an example, you can have multiple components such as event listeners, wrappers, etc.
 
-    /src/
-        /Book/
-            /src/
-                /Collection/
-                    /BookCollection.php
-                /Entity/
-                    /Book.php
-                /Handler/
-                    /BookHandler.php
-                /Repository/
-                    /BookRepository.php
-                /Service/
-                    /BookService.php
-                /InputFilter/
-                    /Input/
-                        /NameInput.php
-                        /AuthorInput.php
-                        /ReleaseDateInput.php
-                    /BookInputFilter.php
-            ConfigProvider.php
-            RoutesDelegator.php
+```
+/src/
+    /Book/
+        /src/
+            /Collection/
+                /BookCollection.php
+            /Entity/
+                /Book.php
+            /Handler/
+                /BookHandler.php
+            /Repository/
+                /BookRepository.php
+            /Service/
+                /BookService.php
+            /InputFilter/
+                /Input/
+                    /NameInput.php
+                    /AuthorInput.php
+                    /ReleaseDateInput.php
+                /BookInputFilter.php
+        ConfigProvider.php
+        RoutesDelegator.php
+```
 
 * `src/Book/src/Collection/BookCollection.php` - a collection refers to a container for a group of related objects, typically used to manage sets of related entities fetched from a database
 * `src/Book/src/Entity/Book.php` - an entity refers to a PHP class that represents a persistent object or data structure