diff --git a/classes/external/addbookingoption.php b/classes/external/addbookingoption.php
index 224c35143..657df2bc2 100644
--- a/classes/external/addbookingoption.php
+++ b/classes/external/addbookingoption.php
@@ -185,18 +185,18 @@ public static function execute_parameters(): external_function_parameters {
      * @param int|null $removeafterminutes
      * @param string|null $notifcationtext
      * @param int|null $notifcationtextformat
-     * @param int $disablebookingusers
+     * @param int|null $disablebookingusers
      * @param string|null $beforebookedtext
      * @param string|null $beforecompletedtext
      * @param string|null $aftercompletedtext
      * @param string|null $shorturl
-     * @param int $duration
+     * @param int|null $duration
      * @param string|null $useremail
      * @param string|null $teacheremail
      * @param string|null $userusername
      * @param string|null $coursestarttime
      * @param string|null $courseendtime
-     * @param int $invisible
+     * @param int|null $invisible
      * @param string|null $responsiblecontact
      * @param string|null $boavenrolledincourse
      * @param string|null $recommendedin
diff --git a/classes/message_controller.php b/classes/message_controller.php
index efd6a342e..bf77bdc19 100644
--- a/classes/message_controller.php
+++ b/classes/message_controller.php
@@ -123,13 +123,14 @@ class message_controller {
 
     /**
      * Constructor
+     *
      * @param int $msgcontrparam message controller param (send now | queue adhoc)
      * @param int $messageparam the message type
      * @param int $cmid course module id
      * @param int $optionid option id
      * @param int $userid user id
      * @param ?int $bookingid booking id
-     * @param ?int|null $optiondateid optional id of a specific session (optiondate)
+     * @param ?int $optiondateid optional id of a specific session (optiondate)
      * @param ?array $changes array of changes for change notifications
      * @param string $customsubject subject of custom messages
      * @param string $custommessage body of custom messages
diff --git a/classes/signinsheet/signinsheet_generator.php b/classes/signinsheet/signinsheet_generator.php
index 4ea77fb81..c915af683 100755
--- a/classes/signinsheet/signinsheet_generator.php
+++ b/classes/signinsheet/signinsheet_generator.php
@@ -221,8 +221,9 @@ class signinsheet_generator {
     /**
      * Define basic variable values for signinsheet pdf
      *
-     * @param ?\mod_booking\booking_option $bookingoption
      * @param \stdClass $pdfoptions
+     * @param ?\mod_booking\booking_option $bookingoption
+     *
      */
     public function __construct(\stdClass $pdfoptions, ?\mod_booking\booking_option $bookingoption = null) {