diff --git a/man/start-stop-daemon.8 b/man/start-stop-daemon.8
index 20987cc5..00ef29f9 100644
--- a/man/start-stop-daemon.8
+++ b/man/start-stop-daemon.8
@@ -145,6 +145,10 @@ stopping schedule.
 If not specified then a default value of SIGTERM/5 is
 assumed.
 .El
+.Sh ENVIRONMENT
+.Va SSD_NICELEVEL
+can also set the scheduling priority of the daemon, but the command line
+option takes precedence.
 .Sh NOTE
 .Nm
 uses