diff --git a/compute/instance/cloud_init.py b/compute/instance/cloud_init.py
index 79bf679..a34e28a 100644
--- a/compute/instance/cloud_init.py
+++ b/compute/instance/cloud_init.py
@@ -206,6 +206,7 @@ class CloudInit:
         Attach cloud-init disk to instance.
 
         :param disk: Path to disk.
+        :param target: Disk target name e.g. `vda`.
         :param instance: Compute instance object.
         """
         instance.attach_device(
diff --git a/compute/session.py b/compute/session.py
index a6b462a..c872568 100644
--- a/compute/session.py
+++ b/compute/session.py
@@ -210,6 +210,9 @@ class Session(AbstractContextManager):
         :param network_interfaces: List of virtual network interfaces
             configs. See :class:`NetworkInterfaceSchema` for more info.
         :type network_interfaces: list[dict]
+        :param cloud_init: Cloud-init configuration. See
+            :class:`CloudInitSchema` for info.
+        :type cloud_init: dict
         """
         data = InstanceSchema(**kwargs)
         config = InstanceConfig(data)
diff --git a/docs/source/cli/cloud_init.rst b/docs/source/cli/cloud_init.rst
index 1aa0614..f5d19b1 100644
--- a/docs/source/cli/cloud_init.rst
+++ b/docs/source/cli/cloud_init.rst
@@ -27,9 +27,6 @@ Cloud-init configs may be set inplace into :file:`instance.yaml`.
      user_data: |
        ## template: jinja
        #cloud-config
-       merge_how:
-         - name: list
-           settings: [append]
        hostname: {{ ds.meta_data.hostname }}
        fqdn: {{ ds.meta_data.hostname }}.instances.generic.cloud
        manage_etc_hosts: true