diff --git a/wp-admin/includes/revision.php b/wp-admin/includes/revision.php
index 51d3763e2c..5fb6c44559 100644
--- a/wp-admin/includes/revision.php
+++ b/wp-admin/includes/revision.php
@@ -9,6 +9,8 @@
 /**
  * Get the revision UI diff.
  *
+ * @since 3.6.0
+ *
  * @param object $post The post object.
  * @param int $compare_from The revision id to compare from.
  * @param int $compare_to The revision id to come to.
@@ -81,6 +83,8 @@ function wp_get_revision_ui_diff( $post, $compare_from, $compare_to ) {
 /**
  * Prepare revisions for JavaScript.
  *
+ * @since 3.6.0
+ *
  * @param object $post The post object.
  * @param int $selected_revision_id The selected revision id.
  * @param int $from (optional) The revision id to compare from.