diff --git a/src/cli/one_helper.rb b/src/cli/one_helper.rb
index c5d20f3295..b58fca598a 100644
--- a/src/cli/one_helper.rb
+++ b/src/cli/one_helper.rb
@@ -226,14 +226,20 @@ EOT
             :name   => 'disk',
             :large  => '--disk image0,image1',
             :description => "Disks to attach. To use an image owned by"<<
-                            " other user use user[disk]",
+                            " other user use user[disk]. Add any additional"<<
+                            " attributes separated by ':' and in the shape of"<<
+                            " KEY=VALUE. For example, if the disk must be"<<
+                            " resized, use image0:size=1000 . Or"<<
+                            " image0:size=1000:target=vda,image1:target=vdb",
             :format => Array
         },
         {
             :name   => 'nic',
             :large  => '--nic network0,network1',
             :description => "Networks to attach. To use a network owned by"<<
-                            " other user use user[network]",
+                            " other user use user[network]. Additional"<<
+                            " attributes are supported like with the --disk"<<
+                            " option.",
             :format => Array
         },
         {