diff --git a/wp-includes/class-wp-comment-query.php b/wp-includes/class-wp-comment-query.php
index 01048e6a3f..ec35a2adac 100644
--- a/wp-includes/class-wp-comment-query.php
+++ b/wp-includes/class-wp-comment-query.php
@@ -94,6 +94,7 @@ class WP_Comment_Query {
 	 *
 	 * @since 4.2.0
 	 * @since 4.4.0 `$parent__in` and `$parent__not_in` were added.
+	 * @since 4.4.0 Order by `comment__in` was added.
 	 * @access public
 	 *
 	 * @param string|array $query {
@@ -130,7 +131,7 @@ class WP_Comment_Query {
 	 *                                             'comment_author_url', 'comment_content', 'comment_date',
 	 *                                             'comment_date_gmt', 'comment_ID', 'comment_karma',
 	 *                                             'comment_parent', 'comment_post_ID', 'comment_type', 'user_id',
-	 *                                             'meta_value', 'meta_value_num', the value of $meta_key, and the
+	 *                                             'comment__in', 'meta_value', 'meta_value_num', the value of $meta_key, and the
 	 *                                             array keys of `$meta_query`. Also accepts false, an empty array,
 	 *                                             or 'none' to disable `ORDER BY` clause.
 	 *                                             Default: 'comment_date_gmt'.
@@ -390,7 +391,7 @@ class WP_Comment_Query {
 					$_order = $_value;
 				}
 
-				if ( ! $found_orderby_comment_ID && 'comment_ID' === $_orderby ) {
+				if ( ! $found_orderby_comment_ID && in_array( $_orderby, array( 'comment_ID', 'comment__in' ) ) ) {
 					$found_orderby_comment_ID = true;
 				}
 
@@ -400,6 +401,11 @@ class WP_Comment_Query {
 					continue;
 				}
 
+				if ( 'comment__in' === $_orderby ) {
+					$orderby_array[] = $parsed;
+					continue;
+				}
+
 				$orderby_array[] = $parsed . ' ' . $this->parse_order( $_order );
 			}
 
@@ -772,6 +778,9 @@ class WP_Comment_Query {
 			$parsed = "$wpdb->commentmeta.meta_value";
 		} elseif ( $orderby == 'meta_value_num' ) {
 			$parsed = "$wpdb->commentmeta.meta_value+0";
+		} elseif ( $orderby == 'comment__in' ) {
+			$comment__in = implode( ',', array_map( 'absint', $this->query_vars['comment__in'] ) );
+			$parsed = "FIELD( {$wpdb->comments}.comment_ID, $comment__in )";
 		} elseif ( in_array( $orderby, $allowed_keys ) ) {
 
 			if ( isset( $meta_query_clauses[ $orderby ] ) ) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 34c483e5f3..e7273536a4 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34205';
+$wp_version = '4.4-alpha-34212';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.