versionadded
diff --git a/Doc/library/io.rst b/Doc/library/io.rst
index 57fc825..2a3ee50 100644
--- a/Doc/library/io.rst
+++ b/Doc/library/io.rst
@@ -373,6 +373,8 @@
raw stream to return from this method. They raise
:exc:`UnsupportedOperation`.
+ .. versionadded:: 3.1
+
.. method:: read([n])
Read and return up to *n* bytes. If the argument is omitted, ``None``, or
@@ -613,6 +615,8 @@
have the concept of an underlying buffer and calling this method will
raise :exc:`UnsupportedOperation`.
+ .. versionadded:: 3.1
+
.. method:: read(n)
Read and return at most *n* characters from the stream as a single