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   ==== About Tag Definitions
   
  -A tag is based on a _tag definition_. As its name implies, a _tag definition_ defines information about a specific tag. In Kaui, you must create a tag definition for a user tag before you can attach it to an account or invoice.
  +In order to use a user tag in Kill Bill, you must first create its _tag definition_. As its name implies, a _tag definition_ defines information about a specific tag. In Kaui, you must create a tag definition for a user tag _before_ you can attach it to an account or invoice.
  +
  +[NOTE]
  +*Note:* You cannot add, change, or delete the underlying tag definition for control tags.
   
   === Additional Tag Resources
   
  
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  In Kaui, you can apply one or more tags to accounts and invoices, a tag being a single value. Tags in Kill Bill can be used to convey information about an object type. A tag can just provide information about an object (user tag) or it can actually affect how the object is handled in Kill Bill (control tag).
  
  This section explains how to attach tags to accounts and invoices. It also describes the steps for creating the tag definitions on which a tag is based.
  
  [NOTE]
  *Note:* You can use the API to attach tags to even more object types, such as payments and subscriptions. For more information, see the "Tags" section of the relevant object type section (for example, Payments) in the https://killbill.github.io/slate/[API Reference].
  
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  === Add a Tag Definition
  
  You can create and delete tag definitions for user tags on the <<Add Tag Definition, Tag Definition page>>. To create a new tag definition:
  
  . Open the Tag Definitions page as explain in "<<View All Tags>>".
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