diff --git a/core/content-negotiation.md b/core/content-negotiation.md
index e52c44b86ca..bbc11eb7549 100644
--- a/core/content-negotiation.md
+++ b/core/content-negotiation.md
@@ -196,6 +196,19 @@ api_platform:
         myformat: ['application/vnd.myformat']
 ```
 
+You will also need to declare an encoder which supports the new format:
+
+```yaml
+services:
+    app.api-platform.myformat.encoder:
+      class: ApiPlatform\Serializer\JsonEncoder
+      arguments:
+          $format: 'myformat'
+      # The following lines are only needed if autoconfigure is disabled
+      # tags:
+      #     - { name: 'serializer.encoder' }
+```
+
 API Platform will automatically call the serializer with your defined format name as `format` parameter during the deserialization process (`myformat` in the example).
 It will then return the result to the client with the requested MIME type using its built-in responder.
 For non-standard formats, [a vendor, vanity or unregistered MIME type should be used](https://en.wikipedia.org/wiki/Media_type#Vendor_tree).
diff --git a/core/filters.md b/core/filters.md
index 1887fb2ff10..f87f9e2da83 100644
--- a/core/filters.md
+++ b/core/filters.md
@@ -358,7 +358,7 @@ class SearchFilterParameter
 ```
 ## Doctrine ORM and MongoDB ODM Filters
 
-!> [!WARNING]
+> [!WARNING]
 > Prefer using QueryParameter instead of ApiFilter for more flexibility, this is subject to change in the next major version.
 
 ### Basic Knowledge
diff --git a/core/openapi.md b/core/openapi.md
index 9371a21cff0..c9e961471dc 100644
--- a/core/openapi.md
+++ b/core/openapi.md
@@ -512,8 +512,11 @@ Manually register the Swagger UI controller:
 ```yaml
 # app/config/routes.yaml
 api_doc:
-    path: /api_documentation
+    path: /api_documentation.{_format}
     controller: api_platform.swagger_ui.action
+    methods: ['HEAD', 'GET']
+    defaults:
+        _format: html
 ```
 
 Change `/api_documentation` to the URI you wish Swagger UI to be accessible on.
diff --git a/core/serialization.md b/core/serialization.md
index fb3235fc5e6..37a0ffea3f0 100644
--- a/core/serialization.md
+++ b/core/serialization.md
@@ -8,7 +8,7 @@ API Platform embraces and extends the Symfony Serializer Component to transform
 
 The main serialization process has two stages:
 
-![Serializer workflow](/docs/core/images/SerializerWorkflow.png)
+![Serializer workflow](/images/SerializerWorkflow.png)
 
 > As you can see in the picture above, an array is used as a man-in-the-middle. This way, Encoders will only deal with turning specific formats into arrays and vice versa. The same way, Normalizers will deal with turning specific objects into arrays and vice versa.
 -- [The Symfony documentation](https://symfony.com/doc/current/components/serializer.html)