diff --git a/src/dbus_fast/signature.pxd b/src/dbus_fast/signature.pxd
index 14b3fad..3202de6 100644
--- a/src/dbus_fast/signature.pxd
+++ b/src/dbus_fast/signature.pxd
@@ -14,3 +14,10 @@ cdef class SignatureTree:
 
     cdef public str signature
     cdef public list types
+
+
+cdef class Variant:
+
+    cdef public object type
+    cdef public str signature
+    cdef public object value
diff --git a/src/dbus_fast/signature.py b/src/dbus_fast/signature.py
index d7da371..f554602 100644
--- a/src/dbus_fast/signature.py
+++ b/src/dbus_fast/signature.py
@@ -403,7 +403,8 @@ class Variant:
         signature: Union[str, SignatureTree, SignatureType],
         value: Any,
         verify: bool = True,
-    ):
+    ) -> None:
+        """Init a new Variant."""
         if type(signature) is SignatureTree:
             signature_tree = signature
         elif type(signature) is SignatureType: