diff --git a/ospfd/ospf_vty.c b/ospfd/ospf_vty.c
index 2ba8188..5e5a0b0 100644
--- a/ospfd/ospf_vty.c
+++ b/ospfd/ospf_vty.c
@@ -1976,6 +1976,8 @@
        ospf_area_authentication_message_digest_cmd,
        "area (A.B.C.D|<0-4294967295>) authentication message-digest",
        "OSPF area parameters\n"
+       "OSPF area ID in IP address format\n"
+       "OSPF area ID as a decimal value\n"
        "Enable authentication\n"
        "Use message-digest authentication\n")
 {