diff --git a/auth/mnet/auth.php b/auth/mnet/auth.php
index c3aa2450bb4..09fb24111f4 100644
--- a/auth/mnet/auth.php
+++ b/auth/mnet/auth.php
@@ -448,7 +448,7 @@ class auth_plugin_mnet extends auth_plugin_base {
      * Normally called by the SP after calling user_authorise()
      *
      * @param string $username The username
-     * @param string $courses  Assoc array of courses following the structure of mnetservice_enrol_courses
+     * @param array $courses  Assoc array of courses following the structure of mnetservice_enrol_courses
      * @return bool
      */
     function update_enrolments($username, $courses) {