diff --git a/wp-includes/ms-functions.php b/wp-includes/ms-functions.php
index 2466de9fc..9dc11cc97 100644
--- a/wp-includes/ms-functions.php
+++ b/wp-includes/ms-functions.php
@@ -279,8 +279,8 @@ function remove_user_from_blog($user_id, $blog_id = '', $reassign = '') {
  *
  * @param string $domain The new blog's domain.
  * @param string $path The new blog's path.
- * @param string $string The new blog's title.
- * @param int $site Optional. Defaults to 1.
+ * @param string $weblog_title The new blog's title.
+ * @param int $site_id Optional. Defaults to 1.
  * @return int The ID of the newly created blog
  */
 function create_empty_blog( $domain, $path, $weblog_title, $site_id = 1 ) {
diff --git a/wp-includes/user.php b/wp-includes/user.php
index d9a12c5e8..1c3704e30 100644
--- a/wp-includes/user.php
+++ b/wp-includes/user.php
@@ -723,8 +723,8 @@ function get_blogs_of_user( $user_id, $all = false ) {
  * @since MU 1.1
  * @uses get_blogs_of_user()
  *
- * @param int $user_id The unique ID of the user
- * @param int $blog Optional. If no blog_id is provided, current site is used
+ * @param int $user_id Optional. The unique ID of the user. Defaults to the current user.
+ * @param int $blog_id Optional. ID of the blog to check. Defaults to the current site.
  * @return bool
  */
 function is_user_member_of_blog( $user_id = 0, $blog_id = 0 ) {