extend deprecation for renamed send_file params

CHANGES.rst

@@ -20,6 +20,15 @@ Unreleased
     -   The same blueprint cannot be registered with the same name. Use
         ``name=`` when registering to specify a unique name.
 
+-   Some parameters in ``send_file`` and ``send_from_directory`` were
+    renamed in 2.0. The deprecation period for the old names is extended
+    to 2.2. Be sure to test with deprecation warnings visible.
+
+    -   ``attachment_filename`` is renamed to ``download_name``.
+    -   ``cache_timeout`` is renamed to ``max_age``.
+    -   ``add_etags`` is renamed to ``etag``.
+    -   ``filename`` is renamed to ``path``.
+
 
 Version 2.0.2
 -------------

src/flask/helpers.py

@@ -452,7 +452,7 @@ def _prepare_send_file_kwargs(
         warnings.warn(
             "The 'attachment_filename' parameter has been renamed to"
             " 'download_name'. The old name will be removed in Flask"
-            " 2.1.",
+            " 2.2.",
             DeprecationWarning,
             stacklevel=3,
         )
@@ -461,7 +461,7 @@ def _prepare_send_file_kwargs(
     if cache_timeout is not None:
         warnings.warn(
             "The 'cache_timeout' parameter has been renamed to"
-            " 'max_age'. The old name will be removed in Flask 2.1.",
+            " 'max_age'. The old name will be removed in Flask 2.2.",
             DeprecationWarning,
             stacklevel=3,
         )
@@ -470,7 +470,7 @@ def _prepare_send_file_kwargs(
     if add_etags is not None:
         warnings.warn(
             "The 'add_etags' parameter has been renamed to 'etag'. The"
-            " old name will be removed in Flask 2.1.",
+            " old name will be removed in Flask 2.2.",
             DeprecationWarning,
             stacklevel=3,
         )
@@ -666,7 +666,7 @@ def send_from_directory(
     if filename is not None:
         warnings.warn(
             "The 'filename' parameter has been renamed to 'path'. The"
-            " old name will be removed in Flask 2.1.",
+            " old name will be removed in Flask 2.2.",
             DeprecationWarning,
             stacklevel=2,
         )