diff --git a/doc/source/whatsnew/v3.0.0.rst b/doc/source/whatsnew/v3.0.0.rst
index d597527066dc3..c06c44e755833 100644
--- a/doc/source/whatsnew/v3.0.0.rst
+++ b/doc/source/whatsnew/v3.0.0.rst
@@ -164,7 +164,6 @@ Other API changes
 Deprecations
 ~~~~~~~~~~~~
 
-
 Copy keyword
 ^^^^^^^^^^^^
 
diff --git a/pandas/tests/util/test_deprecate_nonkeyword_arguments.py b/pandas/tests/util/test_deprecate_nonkeyword_arguments.py
index 9f7a0d7bd92fe..ae2bd0b487019 100644
--- a/pandas/tests/util/test_deprecate_nonkeyword_arguments.py
+++ b/pandas/tests/util/test_deprecate_nonkeyword_arguments.py
@@ -113,7 +113,7 @@ def test_one_positional_argument_with_warning_message_analysis():
         assert h(19) == 19
 
 
-@deprecate_nonkeyword_arguments(version="1.1", klass=FutureWarning)
+@deprecate_nonkeyword_arguments(version="1.1", klass=UserWarning)
 def i(a=0, /, b=0, *, c=0, d=0):
     return a + b + c + d
 
@@ -122,6 +122,11 @@ def test_i_signature():
     assert str(inspect.signature(i)) == "(*, a=0, b=0, c=0, d=0)"
 
 
+def test_i_warns_klass():
+    with tm.assert_produces_warning(UserWarning):
+        assert i(1, 2) == 3
+
+
 class Foo:
     @deprecate_nonkeyword_arguments(
         version=None, allowed_args=["self", "bar"], klass=FutureWarning
diff --git a/pandas/tests/util/test_pandas_deprecation_warning.py b/pandas/tests/util/test_pandas_deprecation_warning.py
new file mode 100644
index 0000000000000..1a813b6eb4afb
--- /dev/null
+++ b/pandas/tests/util/test_pandas_deprecation_warning.py
@@ -0,0 +1,25 @@
+import warnings
+
+from pandas.util._decorators import deprecate_kwarg
+from pandas.util._exceptions import Pandas40DeprecationWarning
+
+import pandas._testing as tm
+
+
+def f1():
+    warnings.warn("f1", Pandas40DeprecationWarning)
+
+
+def test_function_warns_pandas_deprecation_warning():
+    with tm.assert_produces_warning(DeprecationWarning):
+        f1()
+
+
+@deprecate_kwarg("old", "new")
+def f2(new=0):
+    return new
+
+
+def test_decorator_warns_pandas_deprecation_warning():
+    with tm.assert_produces_warning(DeprecationWarning):
+        f2(old=1)
diff --git a/pandas/util/_decorators.py b/pandas/util/_decorators.py
index 3d09cda63c546..d5ec738f1e195 100644
--- a/pandas/util/_decorators.py
+++ b/pandas/util/_decorators.py
@@ -54,8 +54,7 @@ def deprecate(
     alt_name : str, optional
         Name to use in preference of alternative.__name__.
     klass : Warning, optional
-        The warning class to use. Defaults to FutureWarning in the
-        last minor version before a major release, otherwise DeprecationWarning.
+        The warning class to use.
     stacklevel : int, default 2
     msg : str
         The message to display in the warning.
@@ -124,8 +123,7 @@ def deprecate_kwarg(
         new arguments. A callable must do its own value checking;
         values not found in a dict will be forwarded unchanged.
     klass : Warning, optional
-        The warning class to use. Defaults to FutureWarning in the
-        last minor version before a major release, otherwise DeprecationWarning.
+        The warning class to use.
     stacklevel : int, default 2
 
     Examples
@@ -300,8 +298,7 @@ def deprecate_nonkeyword_arguments(
         is used.
 
     klass : Warning, optional
-        The warning class to use. Defaults to FutureWarning in the
-        last minor version before a major release, otherwise DeprecationWarning.
+        The warning class to use.
     """
     klass = klass or Pandas40DeprecationWarning