diff --git a/src/wp-includes/ms-deprecated.php b/src/wp-includes/ms-deprecated.php
index feac0bd1da..23add67cee 100644
--- a/src/wp-includes/ms-deprecated.php
+++ b/src/wp-includes/ms-deprecated.php
@@ -37,6 +37,8 @@ function get_dashboard_blog() {
  * @since MU
  * @deprecated 3.0.0 Use wp_generate_password()
  * @see wp_generate_password()
+ *
+ * @param int $len Optional. The length of password to generate. Default 8.
  */
 function generate_random_password( $len = 8 ) {
 	_deprecated_function( __FUNCTION__, '3.0', 'wp_generate_password()' );