diff --git a/wp-includes/cache-compat.php b/wp-includes/cache-compat.php
index da4b9adee7..98f489931e 100644
--- a/wp-includes/cache-compat.php
+++ b/wp-includes/cache-compat.php
@@ -23,7 +23,8 @@ if ( ! function_exists( 'wp_cache_add_multiple' ) ) :
 	 * @param string $group  Optional. Where the cache contents are grouped. Default empty.
 	 * @param int    $expire Optional. When to expire the cache contents, in seconds.
 	 *                       Default 0 (no expiration).
-	 * @return array Array of return values.
+	 * @return bool[] Array of return values, grouped by key. Each value is either
+	 *                true on success, or false if cache key and group already exist.
 	 */
 	function wp_cache_add_multiple( array $data, $group = '', $expire = 0 ) {
 		$values = array();
@@ -53,7 +54,8 @@ if ( ! function_exists( 'wp_cache_set_multiple' ) ) :
 	 * @param string $group  Optional. Where the cache contents are grouped. Default empty.
 	 * @param int    $expire Optional. When to expire the cache contents, in seconds.
 	 *                       Default 0 (no expiration).
-	 * @return array Array of return values.
+	 * @return bool[] Array of return values, grouped by key. Each value is either
+	 *                true on success, or false on failure.
 	 */
 	function wp_cache_set_multiple( array $data, $group = '', $expire = 0 ) {
 		$values = array();
@@ -81,7 +83,8 @@ if ( ! function_exists( 'wp_cache_get_multiple' ) ) :
 	 * @param string $group Optional. Where the cache contents are grouped. Default empty.
 	 * @param bool   $force Optional. Whether to force an update of the local cache
 	 *                      from the persistent cache. Default false.
-	 * @return array Array of values organized into groups.
+	 * @return array Array of return values, grouped by key. Each value is either
+	 *               the cache contents on success, or false on failure.
 	 */
 	function wp_cache_get_multiple( $keys, $group = '', $force = false ) {
 		$values = array();
@@ -107,7 +110,8 @@ if ( ! function_exists( 'wp_cache_delete_multiple' ) ) :
 	 *
 	 * @param array  $keys  Array of keys under which the cache to deleted.
 	 * @param string $group Optional. Where the cache contents are grouped. Default empty.
-	 * @return array Array of return values.
+	 * @return bool[] Array of return values, grouped by key. Each value is either
+	 *                true on success, or false if the contents were not deleted.
 	 */
 	function wp_cache_delete_multiple( array $keys, $group = '' ) {
 		$values = array();
diff --git a/wp-includes/cache.php b/wp-includes/cache.php
index 67b791c584..b7e88efbd0 100644
--- a/wp-includes/cache.php
+++ b/wp-includes/cache.php
@@ -56,7 +56,8 @@ function wp_cache_add( $key, $data, $group = '', $expire = 0 ) {
  * @param string $group  Optional. Where the cache contents are grouped. Default empty.
  * @param int    $expire Optional. When to expire the cache contents, in seconds.
  *                       Default 0 (no expiration).
- * @return array Array of return values.
+ * @return bool[] Array of return values, grouped by key. Each value is either
+ *                true on success, or false if cache key and group already exist.
  */
 function wp_cache_add_multiple( array $data, $group = '', $expire = 0 ) {
 	global $wp_object_cache;
@@ -122,7 +123,8 @@ function wp_cache_set( $key, $data, $group = '', $expire = 0 ) {
  * @param string $group  Optional. Where the cache contents are grouped. Default empty.
  * @param int    $expire Optional. When to expire the cache contents, in seconds.
  *                       Default 0 (no expiration).
- * @return array Array of return values.
+ * @return bool[] Array of return values, grouped by key. Each value is either
+ *                true on success, or false on failure.
  */
 function wp_cache_set_multiple( array $data, $group = '', $expire = 0 ) {
 	global $wp_object_cache;
@@ -164,7 +166,8 @@ function wp_cache_get( $key, $group = '', $force = false, &$found = null ) {
  * @param string $group Optional. Where the cache contents are grouped. Default empty.
  * @param bool   $force Optional. Whether to force an update of the local cache
  *                      from the persistent cache. Default false.
- * @return array Array of values organized into groups.
+ * @return array Array of return values, grouped by key. Each value is either
+ *               the cache contents on success, or false on failure.
  */
 function wp_cache_get_multiple( $keys, $group = '', $force = false ) {
 	global $wp_object_cache;
@@ -200,7 +203,8 @@ function wp_cache_delete( $key, $group = '' ) {
  *
  * @param array  $keys  Array of keys under which the cache to deleted.
  * @param string $group Optional. Where the cache contents are grouped. Default empty.
- * @return array Array of return values.
+ * @return bool[] Array of return values, grouped by key. Each value is either
+ *                true on success, or false if the contents were not deleted.
  */
 function wp_cache_delete_multiple( array $keys, $group = '' ) {
 	global $wp_object_cache;
diff --git a/wp-includes/class-wp-object-cache.php b/wp-includes/class-wp-object-cache.php
index cc7b5850c5..89fd6ff011 100644
--- a/wp-includes/class-wp-object-cache.php
+++ b/wp-includes/class-wp-object-cache.php
@@ -188,7 +188,8 @@ class WP_Object_Cache {
 	 * @param string $group  Optional. Where the cache contents are grouped. Default empty.
 	 * @param int    $expire Optional. When to expire the cache contents, in seconds.
 	 *                       Default 0 (no expiration).
-	 * @return array Array of return values.
+	 * @return bool[] Array of return values, grouped by key. Each value is either
+	 *                true on success, or false if cache key and group already exist.
 	 */
 	public function add_multiple( array $data, $group = '', $expire = 0 ) {
 		$values = array();
@@ -277,7 +278,7 @@ class WP_Object_Cache {
 	 * @param string $group  Optional. Where the cache contents are grouped. Default empty.
 	 * @param int    $expire Optional. When to expire the cache contents, in seconds.
 	 *                       Default 0 (no expiration).
-	 * @return array Array of return values.
+	 * @return bool[] Array of return values, grouped by key. Each value is always true.
 	 */
 	public function set_multiple( array $data, $group = '', $expire = 0 ) {
 		$values = array();
@@ -341,7 +342,8 @@ class WP_Object_Cache {
 	 * @param string $group Optional. Where the cache contents are grouped. Default 'default'.
 	 * @param bool   $force Optional. Whether to force an update of the local cache
 	 *                      from the persistent cache. Default false.
-	 * @return array Array of values organized into groups.
+	 * @return array Array of return values, grouped by key. Each value is either
+	 *               the cache contents on success, or false on failure.
 	 */
 	public function get_multiple( $keys, $group = 'default', $force = false ) {
 		$values = array();
@@ -389,7 +391,8 @@ class WP_Object_Cache {
 	 *
 	 * @param array  $keys  Array of keys to be deleted.
 	 * @param string $group Optional. Where the cache contents are grouped. Default empty.
-	 * @return array Array of return values.
+	 * @return bool[] Array of return values, grouped by key. Each value is either
+	 *                true on success, or false if the contents were not deleted.
 	 */
 	public function delete_multiple( array $keys, $group = '' ) {
 		$values = array();
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 06954bbd72..4eb5971729 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.0-alpha-52707';
+$wp_version = '6.0-alpha-52708';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.