diff --git a/Doc/library/fcntl.rst b/Doc/library/fcntl.rst
index 22f0f25eea7..508c4a53426 100644
--- a/Doc/library/fcntl.rst
+++ b/Doc/library/fcntl.rst
@@ -12,7 +12,9 @@
    pair: UNIX; I/O control
 
 This module performs file control and I/O control on file descriptors. It is an
-interface to the :c:func:`fcntl` and :c:func:`ioctl` Unix routines.
+interface to the :c:func:`fcntl` and :c:func:`ioctl` Unix routines.  For a
+complete description of these calls, see :manpage:`fcntl(2)` and
+:manpage:`ioctl(2)` Unix manual pages.
 
 All functions in this module take a file descriptor *fd* as their first
 argument.  This can be an integer file descriptor, such as returned by
diff --git a/Doc/library/sqlite3.rst b/Doc/library/sqlite3.rst
index f6e538489ce..996e93eb77e 100644
--- a/Doc/library/sqlite3.rst
+++ b/Doc/library/sqlite3.rst
@@ -190,6 +190,11 @@ Module functions and constants
    any combination of :const:`PARSE_DECLTYPES` and :const:`PARSE_COLNAMES` to turn
    type detection on.
 
+   By default, *check_same_thread* is :const:`True` and only the creating thread may
+   use the connection. If set :const:`False`, the returned connection may be shared
+   across multiple threads. When using multiple threads with the same connection
+   writing operations should be serialized by the user to avoid data corruption.
+
    By default, the :mod:`sqlite3` module uses its :class:`Connection` class for the
    connect call.  You can, however, subclass the :class:`Connection` class and make
    :func:`connect` use your class instead by providing your class for the *factory*
diff --git a/Doc/library/termios.rst b/Doc/library/termios.rst
index a90a825be44..d225d94f910 100644
--- a/Doc/library/termios.rst
+++ b/Doc/library/termios.rst
@@ -10,10 +10,10 @@
    pair: POSIX; I/O control
    pair: tty; I/O control
 
-This module provides an interface to the POSIX calls for tty I/O control.  For a
-complete description of these calls, see the POSIX or Unix manual pages.  It is
-only available for those Unix versions that support POSIX *termios* style tty
-I/O control (and then only if configured at installation time).
+This module provides an interface to the POSIX calls for tty I/O control. For a
+complete description of these calls, see :manpage:`termios(2)` Unix manual
+page.  It is only available for those Unix versions that support POSIX
+*termios* style tty I/O control configured during installation.
 
 All functions in this module take a file descriptor *fd* as their first
 argument.  This can be an integer file descriptor, such as returned by