diff --git a/doc/user/ospfd.rst b/doc/user/ospfd.rst
index 692ce8c1b2..8d67ec865f 100644
--- a/doc/user/ospfd.rst
+++ b/doc/user/ospfd.rst
@@ -80,11 +80,13 @@ Routers
 
 To start OSPF process you have to specify the OSPF router.
 
-.. clicmd:: router ospf [(1-65535)] vrf NAME
+.. clicmd:: router ospf [{(1-65535)|vrf NAME}]
 
 
    Enable or disable the OSPF process.
 
+   Multiple instances don't support `vrf NAME`.
+
 .. clicmd:: ospf router-id A.B.C.D