1 files changed, 24 insertions, 7 deletions
diff --git a/Doc/library/io.rst b/Doc/library/io.rst
index 79f65e0..3a9872a 100644
--- a/Doc/library/io.rst
+++ b/Doc/library/io.rst
@@ -385,8 +385,8 @@ I/O Base Classes
    .. method:: readinto(b)
 
       Read up to ``len(b)`` bytes into :class:`bytearray` *b* and return the
-      number of bytes read.  If the object is in non-blocking mode and no
-      bytes are available, ``None`` is returned.
+      number of bytes read.  If the object is in non-blocking mode and no bytes
+      are available, ``None`` is returned.
 
    .. method:: write(b)
 
@@ -459,10 +459,11 @@ I/O Base Classes
 
    .. method:: read1(size=-1)
 
-      Read and return up to *size* bytes, with at most one call to the underlying
-      raw stream's :meth:`~RawIOBase.read` method.  This can be useful if you
-      are implementing your own buffering on top of a :class:`BufferedIOBase`
-      object.
+      Read and return up to *size* bytes, with at most one call to the
+      underlying raw stream's :meth:`~RawIOBase.read` (or
+      :meth:`~RawIOBase.readinto`) method.  This can be useful if you
+      are implementing your own buffering on top of a
+      :class:`BufferedIOBase` object.
 
    .. method:: readinto(b)
 
@@ -472,8 +473,19 @@ I/O Base Classes
       Like :meth:`read`, multiple reads may be issued to the underlying raw
       stream, unless the latter is interactive.
 
+      A :exc:`BlockingIOError` is raised if the underlying raw stream is in non
+      blocking-mode, and has no data available at the moment.
+
+   .. method:: readinto1(b)
+
+      Read up to ``len(b)`` bytes into bytearray *b*, using at most one call to
+      the underlying raw stream's :meth:`~RawIOBase.read` (or
+      :meth:`~RawIOBase.readinto`) method. Return the number of bytes read.
+
       A :exc:`BlockingIOError` is raised if the underlying raw stream is in
-      non blocking-mode, and has no data available at the moment.
+      non-blocking mode and has no data available at the moment.
+
+      .. versionadded:: 3.5
 
    .. method:: write(b)
 
@@ -590,6 +602,11 @@ than raw I/O does.
 
       In :class:`BytesIO`, this is the same as :meth:`read`.
 
+   .. method:: readinto1()
+
+      In :class:`BytesIO`, this is the same as :meth:`readinto`.
+
+      .. versionadded:: 3.5
 
 .. class:: BufferedReader(raw, buffer_size=DEFAULT_BUFFER_SIZE)