diff --git a/data/schema/KEY-CERT-SCHEMA b/data/schema/KEY-CERT-SCHEMA
index efacac959..d3be455a0 100644
--- a/data/schema/KEY-CERT-SCHEMA
+++ b/data/schema/KEY-CERT-SCHEMA
@@ -1,7 +1,7 @@
 schema:             KEY-CERT-SCHEMA
 ref:                dn42.key-cert
 key:                key-cert     required  single    primary schema
-key:                method       required  single    > {PGP|X509}
+key:                method       required  single    > {PGP|X509|MTN}
 key:                owner        required  multiple
 key:                fingerpr     required  single
 key:                certif       required  multiple
diff --git a/data/schema/MNTNER-SCHEMA b/data/schema/MNTNER-SCHEMA
index 3590ec089..0b6df9030 100644
--- a/data/schema/MNTNER-SCHEMA
+++ b/data/schema/MNTNER-SCHEMA
@@ -5,7 +5,7 @@ key:                descr          optional  single
 key:                mnt-by         required  multiple  lookup=dn42.mntner
 key:                admin-c        optional  multiple  lookup=dn42.person,dn42.role
 key:                tech-c         optional  multiple  lookup=dn42.person,dn42.role
-key:                auth           optional  multiple  > [method] [value]
+key:                auth           optional  multiple  > [method] [value]...
 key:                org            optional  multiple  lookup=dn42.organisation
 key:                abuse-mailbox  optional  single
 key:                sha512-pw      optional  single