diff --git a/mesonbuild/interpreterbase/decorators.py b/mesonbuild/interpreterbase/decorators.py
index 1a203f832..8f4929fe1 100644
--- a/mesonbuild/interpreterbase/decorators.py
+++ b/mesonbuild/interpreterbase/decorators.py
@@ -388,10 +388,10 @@ class KwargInfo(T.Generic[_T]):
                  default: T.Optional[_T] = None,
                  since: T.Optional[str] = None,
                  since_message: T.Optional[str] = None,
-                 since_values: T.Optional[T.Dict[_T, str]] = None,
+                 since_values: T.Optional[T.Dict[_T, T.Union[str, T.Tuple[str, str]]]] = None,
                  deprecated: T.Optional[str] = None,
                  deprecated_message: T.Optional[str] = None,
-                 deprecated_values: T.Optional[T.Dict[_T, str]] = None,
+                 deprecated_values: T.Optional[T.Dict[_T, T.Union[str, T.Tuple[str, str]]]] = None,
                  validator: T.Optional[T.Callable[[T.Any], T.Optional[str]]] = None,
                  convertor: T.Optional[T.Callable[[_T], object]] = None,
                  not_set_warning: T.Optional[str] = None):
@@ -417,10 +417,10 @@ class KwargInfo(T.Generic[_T]):
                default: T.Union[_T, None, _NULL_T] = _NULL,
                since: T.Union[str, None, _NULL_T] = _NULL,
                since_message: T.Union[str, None, _NULL_T] = _NULL,
-               since_values: T.Union[T.Dict[_T, str], None, _NULL_T] = _NULL,
+               since_values: T.Union[T.Dict[_T, T.Union[str, T.Tuple[str, str]]], None, _NULL_T] = _NULL,
                deprecated: T.Union[str, None, _NULL_T] = _NULL,
                deprecated_message: T.Union[str, None, _NULL_T] = _NULL,
-               deprecated_values: T.Union[T.Dict[_T, str], None, _NULL_T] = _NULL,
+               deprecated_values: T.Union[T.Dict[_T, T.Union[str, T.Tuple[str, str]]], None, _NULL_T] = _NULL,
                validator: T.Union[T.Callable[[_T], T.Optional[str]], None, _NULL_T] = _NULL,
                convertor: T.Union[T.Callable[[_T], TYPE_var], None, _NULL_T] = _NULL) -> 'KwargInfo':
         """Create a shallow copy of this KwargInfo, with modifications.
@@ -535,6 +535,7 @@ def typed_kwargs(name: str, *types: KwargInfo) -> T.Callable[..., T.Any]:
                             raise InvalidArguments(f'{name} keyword argument "{info.name}" {msg}')
 
                     warn: bool
+                    msg: T.Optional[str]
                     if info.deprecated_values is not None:
                         for n, version in info.deprecated_values.items():
                             if isinstance(value, (dict, list)):
@@ -543,7 +544,11 @@ def typed_kwargs(name: str, *types: KwargInfo) -> T.Callable[..., T.Any]:
                                 warn = n == value
 
                             if warn:
-                                FeatureDeprecated.single_use(f'"{name}" keyword argument "{info.name}" value "{n}"', version, subproject, location=node)
+                                if isinstance(version, tuple):
+                                    version, msg = version
+                                else:
+                                    msg = None
+                                FeatureDeprecated.single_use(f'"{name}" keyword argument "{info.name}" value "{n}"', version, subproject, msg, location=node)
 
                     if info.since_values is not None:
                         for n, version in info.since_values.items():
@@ -553,7 +558,11 @@ def typed_kwargs(name: str, *types: KwargInfo) -> T.Callable[..., T.Any]:
                                 warn = n == value
 
                             if warn:
-                                FeatureNew.single_use(f'"{name}" keyword argument "{info.name}" value "{n}"', version, subproject, location=node)
+                                if isinstance(version, tuple):
+                                    version, msg = version
+                                else:
+                                    msg = None
+                                FeatureNew.single_use(f'"{name}" keyword argument "{info.name}" value "{n}"', version, subproject, msg, location=node)
 
                 elif info.required:
                     raise InvalidArguments(f'{name} is missing required keyword argument "{info.name}"')
diff --git a/unittests/internaltests.py b/unittests/internaltests.py
index ba61297b9..3cdf3dcb3 100644
--- a/unittests/internaltests.py
+++ b/unittests/internaltests.py
@@ -1379,7 +1379,7 @@ class InternalTests(unittest.TestCase):
         @typed_kwargs(
             'testfunc',
             KwargInfo('input', ContainerTypeInfo(list, str), listify=True, default=[], deprecated_values={'foo': '0.9'}, since_values={'bar': '1.1'}),
-            KwargInfo('output', ContainerTypeInfo(dict, str), default={}, deprecated_values={'foo': '0.9'}, since_values={'bar': '1.1'}),
+            KwargInfo('output', ContainerTypeInfo(dict, str), default={}, deprecated_values={'foo': '0.9', 'foo2': ('0.9', 'dont use it')}, since_values={'bar': '1.1', 'bar2': ('1.1', 'use this')}),
             KwargInfo('install_dir', (bool, str, NoneType), deprecated_values={False: '0.9'}),
             KwargInfo(
                 'mode',
@@ -1403,10 +1403,18 @@ class InternalTests(unittest.TestCase):
             _(None, mock.Mock(subproject=''), [], {'output': {'foo': 'a'}})
             self.assertRegex(out.getvalue(), r"""WARNING:.Project targeting '1.0'.*deprecated since '0.9': "testfunc" keyword argument "output" value "foo".*""")
 
+        with self.subTest('deprecated dict string value with msg'), mock.patch('sys.stdout', io.StringIO()) as out:
+            _(None, mock.Mock(subproject=''), [], {'output': {'foo2': 'a'}})
+            self.assertRegex(out.getvalue(), r"""WARNING:.Project targeting '1.0'.*deprecated since '0.9': "testfunc" keyword argument "output" value "foo2". dont use it.*""")
+
         with self.subTest('new dict string value'), mock.patch('sys.stdout', io.StringIO()) as out:
             _(None, mock.Mock(subproject=''), [], {'output': {'bar': 'b'}})
             self.assertRegex(out.getvalue(), r"""WARNING:.Project targeting '1.0'.*introduced in '1.1': "testfunc" keyword argument "output" value "bar".*""")
 
+        with self.subTest('new dict string value with msg'), mock.patch('sys.stdout', io.StringIO()) as out:
+            _(None, mock.Mock(subproject=''), [], {'output': {'bar2': 'a'}})
+            self.assertRegex(out.getvalue(), r"""WARNING:.Project targeting '1.0'.*introduced in '1.1': "testfunc" keyword argument "output" value "bar2". use this.*""")
+
         with self.subTest('non string union'), mock.patch('sys.stdout', io.StringIO()) as out:
             _(None, mock.Mock(subproject=''), [], {'install_dir': False})
             self.assertRegex(out.getvalue(), r"""WARNING:.Project targeting '1.0'.*deprecated since '0.9': "testfunc" keyword argument "install_dir" value "False".*""")