Add affiliate disclosure to top of posts

functions.php

<?php // do not include this line

add_action( 'genesis_entry_content', 'oc_snippet_do_disclosure', 1 );
function oc_snippet_do_disclosure() {
  if ( is_singular( 'post' ) ) {
    echo '<p><strong>Disclosure: </strong>This post may contain affiliate links. I receive a small commission at no cost to you when you make a purchase using my link.</p>';
  }
}

genesis-simple-hooks.php

<?php if ( is_singular( 'post' ) ) {
  echo '<p><strong>Disclosure: </strong>This post may contain affiliate links. I receive a small commission at no cost to you when you make a purchase using my link.</p>';
} ?>

gsh-below-share.php

<?php if ( is_singular( 'post' ) ) { ?>
  [ssbp]
  <p><strong>Disclosure: </strong>This post may contain affiliate links. I receive a small commission at no cost to you when you make a purchase using my link.</p>
<?php } ?>