diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst
index bc7411c..e16bd77 100644
--- a/Doc/library/stdtypes.rst
+++ b/Doc/library/stdtypes.rst
@@ -1071,9 +1071,10 @@
 .. method:: str.join(iterable)
 
    Return a string which is the concatenation of the strings in *iterable*.
-   A :exc:`TypeError` will be raised if there are any non-string values in
-   *iterable*, including :class:`bytes` objects.  The separator between
-   elements is the string providing this method.
+   If there is any Unicode object in *iterable*, return a Unicode instead.
+   A :exc:`TypeError` will be raised if there are any non-string or non Unicode
+   object values in *iterable*.  The separator between elements is the string
+   providing this method.
 
 
 .. method:: str.ljust(width[, fillchar])