diff --git a/src/wp-cron.php b/src/wp-cron.php
index 6ce1a3da9a..75379a053c 100644
--- a/src/wp-cron.php
+++ b/src/wp-cron.php
@@ -26,7 +26,16 @@ if ( !defined('ABSPATH') ) {
 	require_once( dirname( __FILE__ ) . '/wp-load.php' );
 }
 
-// Uncached doing_cron transient fetch
+/**
+ * Retrieves the cron lock.
+ *
+ * Returns the uncached `doing_cron` transient.
+ *
+ * @ignore
+ * @since 3.3.0
+ *
+ * @return string|false Value of the `doing_cron` transient, 0|false otherwise.
+ */
 function _get_cron_lock() {
 	global $wpdb;