diff --git a/Doc/library/signal.rst b/Doc/library/signal.rst
index 7b40e8e..a3d562b 100644
--- a/Doc/library/signal.rst
+++ b/Doc/library/signal.rst
@@ -76,7 +76,9 @@
 
 .. 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:: 3.2
@@ -84,7 +86,9 @@
 
 .. 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:: 3.2