diff --git a/docs/custom_fields.md b/docs/custom_fields.md
index a82a2ee..a380ab1 100644
--- a/docs/custom_fields.md
+++ b/docs/custom_fields.md
@@ -1,14 +1,22 @@
 ## Custom Fields
 You can generate a custom field with:
 
+```bash
 rails g madmin:field Custom
+```
+
 This will create a CustomField class in app/madmin/fields/custom_field.rb And the related views:
 
+```bash
 # -> app/views/madmin/fields/custom_field/_form.html.erb
 # -> app/views/madmin/fields/custom_field/_index.html.erb
 # -> app/views/madmin/fields/custom_field/_show.html.erb
+```
+
 You can then use this field on our resource:
 
+```ruby
 class PostResource < Madmin::Resource
   attribute :title, field: CustomField
-end
\ No newline at end of file
+end
+```