diff --git a/CHANGES.rst b/CHANGES.rst
index 0d89c6d01..2e408af14 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -21,10 +21,10 @@ Unreleased
     the requested size in one ``read`` call. :issue:`2558`
 -   A cookie header that starts with ``=`` is treated as an empty key and discarded,
     rather than stripping the leading ``==``.
--   Specify a maximum number of multipart parts, default 100, after
-    which a RequestEntityTooLarge exception is raised on parsing. The
-    mitigates a DOS attack whereby a larger number file/form parts are
-    sent resulting in a heavy parsing cost.
+-   Specify a maximum number of multipart parts, default 1000, after which a
+    ``RequestEntityTooLarge`` exception is raised on parsing. This mitigates a DoS
+    attack where a larger number of form/file parts would result in disproportionate
+    resource use.
 
 
 Version 2.2.2
diff --git a/src/werkzeug/formparser.py b/src/werkzeug/formparser.py
index 820190be2..bebb2fc8f 100644
--- a/src/werkzeug/formparser.py
+++ b/src/werkzeug/formparser.py
@@ -179,10 +179,8 @@ class FormDataParser:
     :param cls: an optional dict class to use.  If this is not specified
                        or `None` the default :class:`MultiDict` is used.
     :param silent: If set to False parsing errors will not be caught.
-    :param max_form_parts: the maximum number of parts to be accepted for the
-                           multipart data sent. If this is exceeded an
-                           :exc:`~exceptions.RequestEntityTooLarge` exception
-                           is raised.
+    :param max_form_parts: The maximum number of parts to be parsed. If this is
+        exceeded, a :exc:`~exceptions.RequestEntityTooLarge` exception is raised.
     """
 
     def __init__(
@@ -194,6 +192,7 @@ def __init__(
         max_content_length: t.Optional[int] = None,
         cls: t.Optional[t.Type[MultiDict]] = None,
         silent: bool = True,
+        *,
         max_form_parts: t.Optional[int] = None,
     ) -> None:
         if stream_factory is None:
@@ -204,13 +203,13 @@ def __init__(
         self.errors = errors
         self.max_form_memory_size = max_form_memory_size
         self.max_content_length = max_content_length
+        self.max_form_parts = max_form_parts
 
         if cls is None:
             cls = MultiDict
 
         self.cls = cls
         self.silent = silent
-        self.max_form_parts = max_form_parts
 
     def get_parse_func(
         self, mimetype: str, options: t.Dict[str, str]
@@ -419,7 +418,7 @@ def parse(
         )
 
         parser = MultipartDecoder(
-            boundary, self.max_form_memory_size, self.max_form_parts
+            boundary, self.max_form_memory_size, max_parts=self.max_form_parts
         )
 
         fields = []
diff --git a/src/werkzeug/sansio/multipart.py b/src/werkzeug/sansio/multipart.py
index d90b445b9..2684e5dd6 100644
--- a/src/werkzeug/sansio/multipart.py
+++ b/src/werkzeug/sansio/multipart.py
@@ -87,6 +87,7 @@ def __init__(
         self,
         boundary: bytes,
         max_form_memory_size: Optional[int] = None,
+        *,
         max_parts: Optional[int] = None,
     ) -> None:
         self.buffer = bytearray()
diff --git a/src/werkzeug/wrappers/request.py b/src/werkzeug/wrappers/request.py
index fa5b18586..2de77df42 100644
--- a/src/werkzeug/wrappers/request.py
+++ b/src/werkzeug/wrappers/request.py
@@ -83,12 +83,9 @@ class Request(_SansIORequest):
     #: .. versionadded:: 0.5
     max_form_memory_size: t.Optional[int] = None
 
-    #: the maximum number of multipart parts. This is forwarded to teh
-    #: form data parsing function (:func:`parse_form_data`).  When the
-    #: :attr:`form` or :attr:`files` attribute is accessed and the
-    #: parsing fails because more parts than the specified value is
-    #: transmitted a :exc:`~werkzeug.exceptions.RequestEntityTooLarge`
-    #: exception is raised.
+    #: The maximum number of multipart parts to parse, passed to
+    #: :attr:`form_data_parser_class`. Parsing form data with more than this
+    #: many parts will raise :exc:`~.RequestEntityTooLarge`.
     #:
     #: .. versionadded:: 2.2.3
     max_form_parts = 1000