diff --git a/Doc/library/urllib.parse.rst b/Doc/library/urllib.parse.rst
index 49276da..84d289b 100644
--- a/Doc/library/urllib.parse.rst
+++ b/Doc/library/urllib.parse.rst
@@ -571,7 +571,7 @@
    percent-encoded sequences into Unicode characters, as accepted by the
    :meth:`bytes.decode` method.
 
-   *string* must be a :class:`str`.
+   *string* may be either a :class:`str` or a :class:`bytes`.
 
    *encoding* defaults to ``'utf-8'``.
    *errors* defaults to ``'replace'``, meaning invalid sequences are replaced
@@ -579,6 +579,11 @@
 
    Example: ``unquote('/El%20Ni%C3%B1o/')`` yields ``'/El Niño/'``.
 
+   .. versionchanged:: 3.9
+      *string* parameter supports bytes and str objects (previously only str).
+
+
+
 
 .. function:: unquote_plus(string, encoding='utf-8', errors='replace')