diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index dacf87a..e328399 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -1491,7 +1491,14 @@
 
    Send signal *sig* to the process *pid*.  Constants for the specific signals
    available on the host platform are defined in the :mod:`signal` module.
-   Availability: Unix.
+
+   Windows: The :data:`signal.CTRL_C_EVENT` and
+   :data:`signal.CTRL_BREAK_EVENT` signals are special signals which can
+   only be sent to console processes which share a common console window,
+   e.g., some subprocesses. Any other value for *sig* will cause the process
+   to be unconditionally killed by the TerminateProcess API, and the exit code
+   will be set to *sig*. The Windows version of :func:`kill` additionally takes
+   process handles to be killed.
 
 
 .. function:: killpg(pgid, sig)
diff --git a/Doc/library/signal.rst b/Doc/library/signal.rst
index c6a3fe4..45b78a2 100644
--- a/Doc/library/signal.rst
+++ b/Doc/library/signal.rst
@@ -74,6 +74,20 @@
    the system are defined by this module.
 
 
+.. data:: CTRL_C_EVENT
+
+   The signal corresponding to the CTRL+C keystroke event.
+
+   Availability: Windows.
+
+
+.. data:: CTRL_BREAK_EVENT
+
+   The signal corresponding to the CTRL+BREAK keystroke event.
+
+   Availability: Windows.
+
+
 .. data:: NSIG
 
    One more than the number of the highest signal number.
diff --git a/Doc/library/subprocess.rst b/Doc/library/subprocess.rst
index 13698e7..4b19761 100644
--- a/Doc/library/subprocess.rst
+++ b/Doc/library/subprocess.rst
@@ -373,8 +373,9 @@
 
    .. note::
 
-      On Windows only SIGTERM is supported so far. It's an alias for
-      :meth:`terminate`.
+      On Windows, SIGTERM is an alias for :meth:`terminate`. CTRL_C_EVENT and
+      CTRL_BREAK_EVENT can be sent to processes started with a `creationflags`
+      parameter which includes `CREATE_NEW_PROCESS_GROUP`.
 
 
 .. method:: Popen.terminate()