# Updating LF-Tag expressions
<a name="TBAC-updating-expressions"></a>

Only data lake administrators, the LF-Tag expression creator, and principals that have `Alter` or `Super` permission on the LF-Tag expression can update an LF-Tag expression. In addition to `Alter` permission, you also need the `lakeformation:UpdateLFTagExpression` IAM permission and `Grant with LF-Tag` permission on all underlying keys-values on the new expression body to update expressions.

You update an LF-Tag expression by updating the description, expression body and permissions granted on the expression. You can't change the name of the LF-Tag expression. To change the name, delete the LF-Tag expression and add one with the required parameters. 

You can update an LF-Tag expression by using the AWS Lake Formation console, the API, or the AWS Command Line Interface (AWS CLI).

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#### [ Console ]

**To update an LF-Tag expression**

1. Open the Lake Formation console at [https://console.aws.amazon.com/lakeformation/](https://console.aws.amazon.com/lakeformation/).

   Sign in as a data lake administrator, the LF-Tag creator or a principal with `Alter` permission on the LF-Tag.

1. In the navigation pane, under permissions, choose **LF-Tags and permissions**.

1. Choose **LF-Tag expressions** tab.

1. On the **LF-Tag expressions** section, select an LF-Tag expression, and then choose **Edit**.

1. In the **Edit LF-Tag expression** dialog box, update the description and update the expression body by adding or removing keys and values.

   To add multiple values, in the **Values** field, choose the values from the drop down.

1. Choose **Save**.

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#### [ AWS CLI ]

 The update-lf-tag-expression command in Lake Formation allows you to update an existing LF-Tag expression. 

```
aws lakeformation update-lf-tag-expression \
-- name expression_name\
-- description new_description \
-- catalog-id catalog_id \
-- expression '{"Expression": [{"TagKey": "tag_key", "TagValues": ["tag_value1", "tag_value2", ...]}]}'
```

Here's what the parameters in the provided command mean: 
+ name – The name of the existing named tag expression that you want to update. 
+ description – A new description for the expression.

  catalog-id – The ID of the Data Catalog where the named tag expression resides. 
+ expression – The new tag expression string that you want to update the expression with.

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