Modification doesn't work

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<?xml version="1.0" encoding="utf-8"?>
<modification>
<name>Name</name>
<version>1.0</version>
<author>Author</author>
<link>http://link.here</link>

<file path="admin/model/catalog/category.php">
        <operation>
            <search><![CDATA[
            'meta_description' => $result['meta_description'],
            ]]></search>
            <add position="after"><![CDATA[
            'radar'      	   => $result['extra'],
            ]]></add>
        </operation>
</file>

</modification>

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<?xml version="1.0" encoding="utf-8"?>

Code: Select all

<code>your_unique_modification_code_or_name</code>