diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
index 9f229291a7..2a2de21cdd 100644
--- a/src/wp-includes/functions.php
+++ b/src/wp-includes/functions.php
@@ -2641,8 +2641,9 @@ function _scalar_wp_die_handler( $message = '' ) {
  * @since 4.1.0
  *
  * @param mixed $data    Variable (usually an array or object) to encode as JSON.
- * @param int   $options Options to be passed to json_encode(). Default 0.
- * @param int   $depth   Maximum depth to walk through $data. Must be greater than 0, default 512.
+ * @param int   $options Optional. Options to be passed to json_encode(). Default 0.
+ * @param int   $depth   Optional. Maximum depth to walk through $data. Must be
+ *                       greater than 0. Default 512.
  * @return bool|string The JSON encoded string, or false if it cannot be encoded.
  */
 function wp_json_encode( $data, $options = 0, $depth = 512 ) {