diff --git a/etc/kayobe/apt.yml b/etc/kayobe/apt.yml
index 5361c84c3..08db21910 100644
--- a/etc/kayobe/apt.yml
+++ b/etc/kayobe/apt.yml
@@ -95,8 +95,8 @@ stackhpc_apt_auth:
 # * machine: 'machine' entry in the auth file
 # * login: 'login' entry in the auth file
 # * password: 'password' entry in the auth file
-# * filename: Name of a file in which to store the auth configuration. The
-#   extension should be '.conf'.
+# * filename: Name of a file in /etc/apt/auth.conf.d in which to store
+#   the auth configuration. The extension should be ``.conf``.
 # Default is an empty list.
 apt_auth: "{{ stackhpc_apt_auth if stackhpc_repos_enabled | bool and stackhpc_repo_mirror_username is truthy else [] }}"
 
diff --git a/etc/kayobe/infra-vms.yml b/etc/kayobe/infra-vms.yml
index f6a1a6fe6..2c4a98fe0 100644
--- a/etc/kayobe/infra-vms.yml
+++ b/etc/kayobe/infra-vms.yml
@@ -31,10 +31,12 @@
 
 # Base image for the infra VM root volume. Default is
 # "https://cloud-images.ubuntu.com/jammy/current/jammy-server-cloudimg-amd64.img"
-# when os_distribution is "ubuntu", or
-# https://dl.rockylinux.org/pub/rocky/9/images/x86_64/Rocky-9-GenericCloud.latest.x86_64.qcow2
-# when os_distribution is "rocky",
-# or
+# when os_distribution is "ubuntu",
+# "https://dl.rockylinux.org/pub/rocky/9/images/x86_64/Rocky-9-GenericCloud.latest.x86_64.qcow2"
+# when os_distribution is "rocky" and seed_vm_boot_firmware is "efi",
+# "https://dl.rockylinux.org/vault/rocky/9.3/images/x86_64/Rocky-9-GenericCloud.latest.x86_64.qcow2"
+# when os_distribution is "rocky" and seed_vm_boot_firmware is not "efi"
+# (default is "bios"), or
 # "https://cloud.centos.org/centos/9-stream/x86_64/images/CentOS-Stream-GenericCloud-9-20221206.0.x86_64.qcow2"
 # otherwise.
 #infra_vm_root_image:
@@ -58,6 +60,12 @@
 # OS family. Needed for config drive generation.
 #infra_vm_os_family:
 
+# Boot firmware. Possible values are 'bios' or 'efi'. Default is 'bios'.
+#infra_vm_boot_firmware:
+
+# Machine type. Libvirt default configuration is used.
+#infra_vm_machine:
+
 ###############################################################################
 # Infrastructure VM node configuration.
 
diff --git a/etc/kayobe/kolla.yml b/etc/kayobe/kolla.yml
index 25d131786..4b08894e7 100644
--- a/etc/kayobe/kolla.yml
+++ b/etc/kayobe/kolla.yml
@@ -680,7 +680,6 @@ kolla_enable_mariabackup: True
 #kolla_enable_openstack_core:
 #kolla_enable_openvswitch:
 #kolla_enable_osprofiler:
-#kolla_enable_outward_rabbitmq:
 kolla_enable_ovn: true
 #kolla_enable_ovs_dpdk:
 #kolla_enable_placement:
diff --git a/etc/kayobe/seed-vm.yml b/etc/kayobe/seed-vm.yml
index f10fbaa19..42aea8da5 100644
--- a/etc/kayobe/seed-vm.yml
+++ b/etc/kayobe/seed-vm.yml
@@ -32,9 +32,11 @@
 # Base image for the seed VM root volume. Default is
 # "https://cloud-images.ubuntu.com/jammy/current/jammy-server-cloudimg-amd64.img"
 # when os_distribution is "ubuntu",
-# https://dl.rockylinux.org/pub/rocky/9/images/x86_64/Rocky-9-GenericCloud.latest.x86_64.qcow2
-# when os_distribution is "rocky",
-# or
+# "https://dl.rockylinux.org/pub/rocky/9/images/x86_64/Rocky-9-GenericCloud.latest.x86_64.qcow2"
+# when os_distribution is "rocky" and seed_vm_boot_firmware is "efi",
+# "https://dl.rockylinux.org/vault/rocky/9.3/images/x86_64/Rocky-9-GenericCloud.latest.x86_64.qcow2"
+# when os_distribution is "rocky" and seed_vm_boot_firmware is not "efi"
+# (default is "bios"), or
 # "https://cloud.centos.org/centos/9-stream/x86_64/images/CentOS-Stream-GenericCloud-9-20221206.0.x86_64.qcow2"
 # otherwise.
 #seed_vm_root_image:
@@ -61,6 +63,12 @@
 #
 #seed_vm_interfaces:
 
+# Boot firmware. Possible values are 'bios' or 'efi'. Default is 'bios'.
+#seed_vm_boot_firmware:
+
+# Machine type. Libvirt default configuration is used.
+#seed_vm_machine:
+
 ###############################################################################
 # Dummy variable to allow Ansible to accept this file.
 workaround_ansible_issue_8743: yes