diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index 00f9d264b9..34d38dafd6 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -5626,7 +5626,7 @@ function wp_generate_uuid4() {
  *
  * @since 4.7.0
  *
- * @param $group Where the cache contents are grouped.
+ * @param string $group Where the cache contents are grouped.
  *
  * @return string $last_changed UNIX timestamp with microseconds representing when the group was last changed.
  */
diff --git a/wp-includes/version.php b/wp-includes/version.php
index effaa1be62..b2a0ce5eb3 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.8-alpha-39899';
+$wp_version = '4.8-alpha-39900';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.