diff --git a/lib/compat/wordpress-6.3/footnotes.php b/lib/compat/wordpress-6.3/footnotes.php
index 963f1f3bb301f..45f4c74b05e37 100644
--- a/lib/compat/wordpress-6.3/footnotes.php
+++ b/lib/compat/wordpress-6.3/footnotes.php
@@ -1,11 +1,24 @@
 <?php
+/**
+ * Compatiblity filters for improved footnotes support.
+ *
+ * In core, this could be fixed directly in key functions.
+ *
+ * @package gutenberg
+ */
 
+/**
+ * Trims footnote anchors from content.
+ *
+ * @param string $content HTML content.
+ * @return string Filtered content.
+ */
 function gutenberg_trim_footnotes( $content ) {
 	if ( ! doing_filter( 'get_the_excerpt' ) ) {
 		return $content;
 	}
 
-	static $footnote_pattern =  '_<sup data-fn="[^"]+" class="[^"]+">\s*<a href="[^"]+" id="[^"]+">\d+</a>\s*</sup>_';
+	static $footnote_pattern = '_<sup data-fn="[^"]+" class="[^"]+">\s*<a href="[^"]+" id="[^"]+">\d+</a>\s*</sup>_';
 	return preg_replace( $footnote_pattern, '', $content );
 }