Index: src/wp-content/themes/twentyseventeen/inc/custom-header.php
===================================================================
--- src/wp-content/themes/twentyseventeen/inc/custom-header.php	(revision 41398)
+++ src/wp-content/themes/twentyseventeen/inc/custom-header.php	(working copy)
@@ -112,7 +112,8 @@
 /**
  * Customize video play/pause button in the custom header.
  *
- * @param array $settings Video settings.
+ * @param  array $settings Video settings.
+ * @return array The filtered video settings.
  */
 function twentyseventeen_video_controls( $settings ) {
 	$settings['l10n']['play'] = '<span class="screen-reader-text">' . __( 'Play background video', 'twentyseventeen' ) . '</span>' . twentyseventeen_get_svg( array( 'icon' => 'play' ) );