diff --git a/Doc/library/signal.rst b/Doc/library/signal.rst
index 7ee5ece8859825..85a073aad233ac 100644
--- a/Doc/library/signal.rst
+++ b/Doc/library/signal.rst
@@ -157,6 +157,8 @@ The variables defined in the :mod:`signal` module are:
 
    Alias to :data:`SIGCHLD`.
 
+   .. availability:: not macOS.
+
 .. data:: SIGCONT
 
    Continue the process if it is currently stopped