diff --git a/src/wp-includes/class-wp-user.php b/src/wp-includes/class-wp-user.php
index 10965761b3..48cb47dce1 100644
--- a/src/wp-includes/class-wp-user.php
+++ b/src/wp-includes/class-wp-user.php
@@ -259,11 +259,13 @@ class WP_User {
 	}
 
 	/**
-	 * Magic method for checking the existence of a certain custom field
+	 * Magic method for checking the existence of a certain custom field.
 	 *
 	 * @since 3.3.0
-	 * @param string $key
-	 * @return bool
+	 * @access public
+	 *
+	 * @param string $key User meta key to check if set.
+	 * @return bool Whether the given user meta key is set.
 	 */
 	public function __isset( $key ) {
 		if ( 'id' == $key ) {