diff --git a/Doc/library/io.rst b/Doc/library/io.rst
index a8a4068..1a4b959 100644
--- a/Doc/library/io.rst
+++ b/Doc/library/io.rst
@@ -226,8 +226,10 @@
 
       Flush and close this stream. This method has no effect if the file is
       already closed. Once the file is closed, any operation on the file
-      (e.g. reading or writing) will raise an :exc:`IOError`. The internal
-      file descriptor isn't closed if *closefd* was False.
+      (e.g. reading or writing) will raise an :exc:`ValueError`.
+
+      As a convenience, it is allowed to call this method more than once;
+      only the first call, however, will have an effect.
 
    .. attribute:: closed
 
@@ -293,7 +295,9 @@
    .. method:: truncate([size])
 
       Truncate the file to at most *size* bytes.  *size* defaults to the current
-      file position, as returned by :meth:`tell`.
+      file position, as returned by :meth:`tell`.  Note that the current file
+      position isn't changed; if you want to change it to the new end of
+      file, you have to :meth:`seek()` explicitly.
 
    .. method:: writable()
 
@@ -467,11 +471,6 @@
 
       In :class:`BytesIO`, this is the same as :meth:`read`.
 
-   .. method:: truncate([size])
-
-      Truncate the buffer to at most *size* bytes.  *size* defaults to the
-      current stream position, as returned by :meth:`tell`.
-
 
 .. class:: BufferedReader(raw[, buffer_size])