function main(findingName = 'full finding path to add marks to') {
  // [START securitycenter_add_finding_security_marks]
  // Imports the Google Cloud client library.
  const {SecurityCenterClient} = require('@google-cloud/security-center');

  // Creates a new client.
  const client = new SecurityCenterClient();

  async function addFindingSecurityMarks() {
    // findingName is the full resource path for the finding to update.
    /*
     * TODO(developer): Uncomment the following lines
     */
    // Specify the value of 'findingName' in one of the following formats:
    //    `organizations/${org-id}/assets/${asset-id}/findings/${finding-id}`;
    //    `projects/${project-id}/assets/${asset-id}/findings/${finding-id}`;
    //    `folders/${folder-id}/assets/${asset-id}/findings/${finding-id}`;
    const [newMarks] = await client.updateSecurityMarks({
      securityMarks: {
        name: `${findingName}/securityMarks`,
        marks: {key_a: 'value_a', key_b: 'value_b'},
      },
      // Only update the marks with these keys.
      updateMask: {paths: ['marks.key_a', 'marks.key_b']},
    });

    console.log('New marks: %j', newMarks);
  }
  addFindingSecurityMarks();
  // [END securitycenter_add_finding_security_marks]
}
Demostrates adding security marks to a finding.