ntpd: mention -N in help text

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/include/usage.src.h b/include/usage.src.h
index ebd8c2e..0eff1b1 100644
--- a/include/usage.src.h
+++ b/include/usage.src.h
@@ -2989,9 +2989,7 @@
      "\n	-d	Verbose" \
      "\n	-n	Do not daemonize" \
      "\n	-q	Quit after clock is set" \
-/* -N exists for mostly compat reasons, thus not essential to inform */ \
-/* the user that it exists: user may use nice as well */ \
-/*   "\n	-N	Run at high priority" */ \
+     "\n	-N	Run at high priority" \
      "\n	-w	Do not set time (only query peers), implies -n" \
      "\n	-l	Run as server on port 123" \
      "\n	-S PROG	Run PROG after stepping time, stratum change, and every 11 mins" \