Update README

README.md

@@ -1089,10 +1089,10 @@ following openapify dataclasses defined in `openapify.core.models`:
 * `QueryParam`
 
 Out of the box, the schema is generated by using
-[`mashumaro`](https://github.com/Fatal1ty/mashumaro) library, but support
-for third-party entity schema generators can be achieved through
-`schema_helper` method. For example, here's what a plugin for pydantic models
-might look like:
+[`mashumaro`](https://github.com/Fatal1ty/mashumaro) library (see the note
+below), but support for third-party entity schema generators can be achieved
+through `schema_helper` method. For example, here's what a plugin for pydantic
+models might look like:
 
 ```python
 from typing import Any
@@ -1116,6 +1116,34 @@ class PydanticSchemaPlugin(BasePlugin):
             return schema
 ```
 
+> [!NOTE]\
+> The [`BaseSchemaPlugin`](https://github.com/Fatal1ty/openapify/blob/master/openapify/core/base_plugins.py#L41-L64),
+> which is enabled by default and has the lowest priority, is responsible for
+> generating the schema. This plugin utilizes the mashumaro library for schema
+> generation, which in turn incorporates its own [plugin system](https://github.com/Fatal1ty/mashumaro?tab=readme-ov-file#json-schema-plugins),
+> enabling customization of JSON Schema generation and support for additional
+> data types. For more nuanced modifications, particularly within nested data
+> models, you can employ BaseSchemaPlugin with a specified list of mashumaro JSON
+> Schema plugins. This approach allows for finer control over schema generation
+> when needed:
+> ```python
+> from mashumaro.jsonschema.plugins import DocstringDescriptionPlugin
+>
+> from openapify import build_spec
+> from openapify.core.base_plugins import BaseSchemaPlugin
+>
+> spec = build_spec(
+>     routes=[...],
+>     plugins=[
+>         BaseSchemaPlugin(
+>             plugins=[
+>                 DocstringDescriptionPlugin(),
+>             ]
+>         ),
+>     ],
+> )
+> ```
+
 ### media_type_helper
 
 A media type is used in OpenAPI Request