diff --git a/wp-includes/cache.php b/wp-includes/cache.php
index 65d3a29eb8..ed5f37e25f 100644
--- a/wp-includes/cache.php
+++ b/wp-includes/cache.php
@@ -184,6 +184,8 @@ function wp_cache_set($key, $data, $group = '', $expire = 0) {
  *
  * This changes the blog id used to create keys in blog specific groups.
  *
+ * @since 3.5.0
+ *
  * @param int $blog_id Blog ID
  */
 function wp_cache_switch_to_blog( $blog_id ) {
@@ -588,6 +590,8 @@ class WP_Object_Cache {
 	 *
 	 * This changes the blog id used to create keys in blog specific groups.
 	 *
+	 * @since 3.5.0
+	 *
 	 * @param int $blog_id Blog ID
 	 */
 	function switch_to_blog( $blog_id ) {