diff --git a/Doc/library/signal.rst b/Doc/library/signal.rst
index 8ac7bee..0f84537 100644
--- a/Doc/library/signal.rst
+++ b/Doc/library/signal.rst
@@ -77,7 +77,9 @@
 
 .. data:: CTRL_C_EVENT
 
-   The signal corresponding to the CTRL+C keystroke event.
+   The signal corresponding to the CTRL+C keystroke event. This signal can
+   only be used with :func:`os.kill`.
+
    Availability: Windows.
 
    .. versionadded:: 2.7
@@ -85,7 +87,9 @@
 
 .. data:: CTRL_BREAK_EVENT
 
-   The signal corresponding to the CTRL+BREAK keystroke event.
+   The signal corresponding to the CTRL+BREAK keystroke event. This signal can
+   only be used with :func:`os.kill`.
+
    Availability: Windows.
 
    .. versionadded:: 2.7
diff --git a/Misc/NEWS b/Misc/NEWS
index 3876b4a..c844ebf 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -193,6 +193,9 @@
 Documentation
 -------------
 
+- Issue #9524: Document that two CTRL* signals are meant for use only
+  with os.kill.
+
 - Issue #9255: Document that the 'test' package is for internal Python use
   only.