diff --git a/deps/rabbitmq_prelaunch/src/rabbit_prelaunch_sighandler.erl b/deps/rabbitmq_prelaunch/src/rabbit_prelaunch_sighandler.erl
index 3bf7053d53a8..0f3000547316 100644
--- a/deps/rabbitmq_prelaunch/src/rabbit_prelaunch_sighandler.erl
+++ b/deps/rabbitmq_prelaunch/src/rabbit_prelaunch_sighandler.erl
@@ -39,6 +39,7 @@
           sigwinch => ignore
          }).
 
+%% https://www.erlang.org/doc/apps/kernel/kernel_app.html#os-signal-event-handler
 -define(SIGNAL_HANDLED_BY_ERLANG(Signal),
         Signal =:= sigusr1 orelse
         Signal =:= sigquit orelse