diff --git a/docs/resources/instance.md b/docs/resources/instance.md
index 0aa73e5..7814b39 100644
--- a/docs/resources/instance.md
+++ b/docs/resources/instance.md
@@ -17,12 +17,15 @@ Multipass instance resource.
 
 ### Required
 
-- `name` (String)
+- `name` (String) Name for the instance. If it is 'primary' (the configured primary instance name), the user's home directory is mounted inside the newly launched instance, in 'Home'.
 
 ### Optional
 
-- `cpus` (Number)
-- `image` (String)
+- `cloudinit_file` (String) Path to a user-data cloud-init configuration.
+- `cpus` (Number) Number of CPUs to allocate. Minimum: 1, default: 1.
+- `disk` (String) Disk space to allocate. Positive integers, in bytes, or with K, M, G suffix. Minimum: 512M, default: 5G.
+- `image` (String) Optional image to launch. If omitted, then the default Ubuntu LTS will be used. <remote> can be either ‘release’ or ‘daily‘. If <remote> is omitted, ‘release’ will be used. <image> can be a partial image hash or an Ubuntu release version, codename or alias. <url> is a custom image URL that is in http://, https://, or file:// format.
+- `memory` (String) Amount of memory to allocate. Positive integers, in bytes, or with K, M, G suffix. Minimum: 128M, default: 1G.
 
 ### Read-Only
 
diff --git a/multipass/resource_instance.go b/multipass/resource_instance.go
index be143b3..5ac96db 100644
--- a/multipass/resource_instance.go
+++ b/multipass/resource_instance.go
@@ -19,20 +19,52 @@ func resourceInstance() *schema.Resource {
 
         Schema: map[string]*schema.Schema{
             "name": {
+                Description: "Name for the instance. If it is 'primary' " +
+                    "(the configured primary instance name), the user's " +
+                    "home directory is mounted inside the newly launched " +
+                    "instance, in 'Home'.",
                 Type:     schema.TypeString,
                 Required: true,
                 ForceNew: true,
             },
             "image": {
+                Description: "Optional image to launch. If omitted, then " +
+                    "the default Ubuntu LTS will be used. <remote> can be " +
+                    "either ‘release’ or ‘daily‘. If <remote> is " +
+                    "omitted, ‘release’ will be used. <image> can be a " +
+                    "partial image hash or an Ubuntu release version, " +
+                    "codename or alias. <url> is a custom image URL " +
+                    "that is in http://, https://, or file:// format.",
                 Type:     schema.TypeString,
                 Optional: true,
                 ForceNew: true,
             },
             "cpus": {
-                Type:     schema.TypeInt,
+                Description: "Number of CPUs to allocate. Minimum: 1, default: 1.",
+                Type:        schema.TypeInt,
+                Optional:    true,
+                ForceNew:    true,
+            },
+            "memory": {
+                Description: "Amount of memory to allocate. Positive integers, " +
+                    "in bytes, or with K, M, G suffix. Minimum: 128M, default: 1G.",
+                Type:     schema.TypeString,
+                Optional: true,
+                ForceNew: true,
+            },
+            "disk": {
+                Description: "Disk space to allocate. Positive integers, in bytes, " +
+                    "or with K, M, G suffix. Minimum: 512M, default: 5G.",
+                Type:     schema.TypeString,
                 Optional: true,
                 ForceNew: true,
             },
+            "cloudinit_file": {
+                Description: "Path to a user-data cloud-init configuration.",
+                Type:        schema.TypeString,
+                Optional:    true,
+                ForceNew:    true,
+            },
         },
     }
 }
@@ -55,15 +87,15 @@ func resourceInstanceRead(ctx context.Context, d *schema.ResourceData, m interfa
 
 func resourceInstanceCreate(ctx context.Context, d *schema.ResourceData, m interface{}) diag.Diagnostics {
     name := d.Get("name").(string)
-    image := d.Get("image").(string)
-    cpus := d.Get("cpus").(int)
-
     d.SetId(name)
 
     _, err := multipass.Launch(&multipass.LaunchReq{
-        Image: image,
-        Name:  name,
-        CPU:   cpus,
+        Name:          name,
+        Image:         d.Get("image").(string),
+        CPU:           d.Get("cpus").(int),
+        Memory:        d.Get("memory").(string),
+        Disk:          d.Get("disk").(string),
+        CloudInitFile: d.Get("cloudinit_file").(string),
     })
 
     if err != nil {