diff --git a/telegram/request/_requestdata.py b/telegram/request/_requestdata.py
index 1b5b5446d..82d1e3d2c 100644
--- a/telegram/request/_requestdata.py
+++ b/telegram/request/_requestdata.py
@@ -55,6 +55,9 @@ class RequestData:
         a single object of type :obj:`int`, :obj:`float`, :obj:`str` or :obj:`bool` or any
         (possibly nested) composition of lists, tuples and dictionaries, where each entry, key
         and value is of one of the mentioned types.
+
+        Returns:
+            Dict[:obj:`str`, Union[:obj:`str`, :obj:`int`, List[any], Dict[any, any]]]
         """
         return {
             param.name: param.value  # type: ignore[misc]
@@ -71,6 +74,9 @@ class RequestData:
             By default, this property uses the standard library's :func:`json.dumps`.
             To use a custom library for JSON encoding, you can directly encode the keys of
             :attr:`parameters` - note that string valued keys should not be JSON encoded.
+
+        Returns:
+            Dict[:obj:`str`, :obj:`str`]
         """
         return {
             param.name: param.json_value
@@ -84,6 +90,9 @@ class RequestData:
         Args:
             encode_kwargs (Dict[:obj:`str`, any], optional): Additional keyword arguments to pass
                 along to :func:`urllib.parse.urlencode`.
+
+        Returns:
+            :obj:`str`
         """
         if encode_kwargs:
             return urlencode(self.json_parameters, **encode_kwargs)
@@ -97,6 +106,9 @@ class RequestData:
             url (:obj:`str`): The URL the parameters will be attached to.
             encode_kwargs (Dict[:obj:`str`, any], optional): Additional keyword arguments to pass
                 along to :func:`urllib.parse.urlencode`.
+
+        Returns:
+            :obj:`str`
         """
         url_parameters = self.url_encoded_parameters(encode_kwargs=encode_kwargs)
         return f"{url}?{url_parameters}"
@@ -109,6 +121,9 @@ class RequestData:
             By default, this property uses the standard library's :func:`json.dumps`.
             To use a custom library for JSON encoding, you can directly encode the keys of
             :attr:`parameters` - note that string valued keys should not be JSON encoded.
+
+        Returns:
+            :obj:`bytes`
         """
         return json.dumps(self.json_parameters).encode(TextEncoding.UTF_8)