# Add rule

Adding the Immutability Tag is a tag rule for the project. The following are the steps for adding tags to immutability:

* Select the Tag Immutability tab, and press the **Add Rule button.**

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* The Add Tag Immutability Rule window appears, in the For the repositories section select matching or excluding according to your needs. Click the Add button to **add** tags.

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**Below are several explanations related to the rule input fields:**

<table><thead><tr><th width="235.3333740234375">Column</th><th>Description</th></tr></thead><tbody><tr><td><strong>For the repositories</strong></td><td>This section is used to choose <strong>which repositories the rule will apply to</strong>.<br><br>- <strong>Matching :</strong> The rule is applied <strong>only to the repositories specified by the user</strong>.<br><br><strong>- Excluding :</strong> The rule is applied <strong>to all repositories, except those specified by the user</strong>.</td></tr><tr><td><strong>Tags</strong></td><td>This section allows you to define <strong>which image tags are protected from modification or overwrite</strong>.<br><br>- <strong>Matching :</strong> The rule is applied <strong>only to the tags specified by the user</strong>.<br><br><strong>- Excluding :</strong> The rule is applied <strong>to all tags, except those specified by the user</strong>.</td></tr></tbody></table>

* After the tag is successfully added, the system will display a notification **“Tags has been successfully created”**, indicating that the data has been added successfully and is now listed in the tags table.

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