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
diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index b853f4d5932..716f7fff534 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -372,9 +372,11 @@ class SubprocessError(Exception): pass
 
 
 class CalledProcessError(SubprocessError):
-    """This exception is raised when a process run by check_call() or
-    check_output() returns a non-zero exit status.
-    The exit status will be stored in the returncode attribute;
+    """Raised when a check_call() or check_output() process returns non-zero.
+
+    The exit status will be stored in the returncode attribute, negative
+    if it represents a signal number.
+
     check_output() will also store the output in the output attribute.
     """
     def __init__(self, returncode, cmd, output=None, stderr=None):
@@ -384,7 +386,16 @@ class CalledProcessError(SubprocessError):
         self.stderr = stderr
 
     def __str__(self):
-        return "Command '%s' returned non-zero exit status %d" % (self.cmd, self.returncode)
+        if self.returncode and self.returncode < 0:
+            try:
+                return "Command '%s' died with %r." % (
+                        self.cmd, signal.Signals(-self.returncode))
+            except ValueError:
+                return "Command '%s' died with unknown signal %d." % (
+                        self.cmd, -self.returncode)
+        else:
+            return "Command '%s' returned non-zero exit status %d." % (
+                    self.cmd, self.returncode)
 
     @property
     def stdout(self):
diff --git a/Lib/test/test_subprocess.py b/Lib/test/test_subprocess.py
index a8f0a64e96e..cb0e2927deb 100644
--- a/Lib/test/test_subprocess.py
+++ b/Lib/test/test_subprocess.py
@@ -1427,6 +1427,27 @@ class POSIXProcessTestCase(BaseTestCase):
             p.wait()
         self.assertEqual(-p.returncode, signal.SIGABRT)
 
+    def test_CalledProcessError_str_signal(self):
+        err = subprocess.CalledProcessError(-int(signal.SIGABRT), "fake cmd")
+        error_string = str(err)
+        # We're relying on the repr() of the signal.Signals intenum to provide
+        # the word signal, the signal name and the numeric value.
+        self.assertIn("signal", error_string.lower())
+        # We're not being specific about the signal name as some signals have
+        # multiple names and which name is revealed can vary.
+        self.assertIn("SIG", error_string)
+        self.assertIn(str(signal.SIGABRT), error_string)
+
+    def test_CalledProcessError_str_unknown_signal(self):
+        err = subprocess.CalledProcessError(-9876543, "fake cmd")
+        error_string = str(err)
+        self.assertIn("unknown signal 9876543.", error_string)
+
+    def test_CalledProcessError_str_non_zero(self):
+        err = subprocess.CalledProcessError(2, "fake cmd")
+        error_string = str(err)
+        self.assertIn("non-zero exit status 2.", error_string)
+
     def test_preexec(self):
         # DISCLAIMER: Setting environment variables is *not* a good use
         # of a preexec_fn.  This is merely a test.
diff --git a/Misc/NEWS b/Misc/NEWS
index 42200628373..57edb496305 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -22,6 +22,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #27167: Clarify the subprocess.CalledProcessError error message text
+  when the child process died due to a signal.
+
 - Issue #25931: Don't define socketserver.Forking* names on platforms such
   as Windows that do not support os.fork().